/* 4.1
* The following code results in compile time error. Identify the error
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_1;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x = 123456;
float f = 100.12;
System.out.println("Float Value = " + f);
}
}
/* Floating point numbers are treated as doubl-precision quantities. To force
them to be in single-precision mode, we must append f or F to the numbers
float f = 100.12F
or
float f = 100.12f
*/
/* 4.2
* The following code results in compile time error. Identify the error
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_2;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int y;
if (x > 10)
{
y = x;
}
System.out.println("Value of Y = " + y);
}
}
/* Variable x is not defined
*/
/* 4.3
* What modification should be done to the following code so that the value of
* the variable pi is not modifiable
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_3;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* When we define symbolic constatnt they cannot be assigned any other
* value.
* Defining pi as symbolic constants
*/
final float PI = 3.14F;
System.out.println("Value of PI = " + PI);
}
}
/* 4.4
* The following code results in compile time error while storing the value of int
* variable to a byte variable. Identify the problem with the code and provide the
* solution
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_4;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int i = 1234;
/* Byte is only 1 byte whereas int is 4 byte.
* So there will be loss of data
* Hence in order to preserve the data we need to type case it to
* either long, float or double
*/
long b = (long)i;
System.out.println("Value of Byte Variable b = " + b);
}
}
/* 4.5
* Identify the error in the following code:
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_5;
/**
*
* @author Azeem
*/
public class Scope {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int m = 10;
{
int m = 20;
}
}
}
/* Variable m is already defined (multiple definition of m) in method Scope
*/
/* 5.1
* In the following code the expected value is 8, but it prints the value 2.What
* would you modify in the code to obtain the expected value ?
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg5_1;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int i = 42 + 45 -48 - 5;
int j = 5 + 5 - 8 + 2;
/* Using division sign instead of modulus
*/
int ans = i / j;
System.out.println("Value of Ans = " + ans);
}
}
/* 5.3
* The following code results in compilation error. Debug the code and rectify
* the problem
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg5_3;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Using arithmetic operators properly
*/
int ans = (2 * (5 - 8) * (5 - 5) + 10) * 2;
System.out.println("Value of Ans = " + ans);
}
}
/* 5.4
* In the code give below what should be changed to obtain the value of 40.0 for
* x
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg5_4;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* rint returns the closest integer value in the argument
* Replacing it with floor which gives the largest integer that is less
* than or equal to the argument.
*/
double x = Math.floor(40.6);
double y = Math.abs(40.6);
System.out.println("Value of X is = " + x + " and Y is = " + y);
}
}
/* 6.1
* Determine whether the following are true or false:
* (a) When if statements are nested, the last else gets associated with the nearest
* if without an else
* Ans: True
* (b) One if can have more than one else clause
* Ans: False
* (c) A switch statement can always be replaced be a series of if..else
* statement
* Ans: True
* (d) A switch expression can be of any type
* Ans: False
* (e) A program stopes its execution when a break statement is encountered
* Ans: False
*/
/* 6.3
* Find errors, if any, in each of the following segments
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_3;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Declaring and initializing variables
*/
int x = 10;
int y = 5;
int z = 8;
/* A conditional operator '==' must be used instead of an
* assignment operator '=' in conditional statemens
*/
if (x + y == z && y > 0){
/* Statements
*/
}
/* Declaring and initializing variables
*/
int a = 10;
int b = 9;
int c = 8;
int code = a + b;
/* If statement ends because of semicolon ';'. Thats fine but else statement
* should immediately follow 'if' statements or it may give a compilation error
* Statements a = b + c and a = 0 should end with a semicolon
*/
if (code > 1)
a = b + c;
else
a = 0;
/* Declaring and initializing variables
*/
int p = 10;
int q = 9;
/* If has no parenthesis which gives compilation error
*/
if ((p < 0) || (q < 0)){
/* Statements
*/
}
}
}
/* 6.6
* Write a program to find the number of and sum of all integers greater than
* 100 and less than 200 that are divisible by 7
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_6;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Initializing variables
*/
int index = 0;
int sum = 0;
int count = 0;
for (index = 100; index <= 200; index++){
/* If the value of index is divisible by 7 then
* Increase count and add that number to sum
*/
if (index % 100 == 0){
count++;
sum = sum + index;
}
}
/* Print out the result
*/
System.out.println("The number of integers dvisible by 7 greater than "
+ "100 but less than 200 is " + count);
System.out.println("The sum of number of integers divisible by 7 greater"
+ " than 100 but less than 200 is " + sum);
}
}
/* 6.7
* A set of two linear equations with two unknown x1 and x2 is given below:
* ax1 + bx2 = m
* cx1 + dx2 = n
* The set has a unique solution
* x1 = (md - bn) / (ad - cd)
* x2 = (na - mc) / (ad - cd)
* provided the denominator ad - cd is not equal to zero
* Write the program that will read the values of constants a, b, c, d, m and n and
* compute the values of x1 and x2.
* An appropriate message shoud be printed if ad - cb = 0
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_7;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Declaring variables
*/
int x1, x2;
int a, b, c, d, m, n;
/* Scanning data from user
*/
Scanner in = new Scanner(System.in);
System.out.println("Enter the value of a");
a = in.nextInt();
System.out.println("Enter the value of b");
b = in.nextInt();
System.out.println("Enter the value of c");
c = in.nextInt();
System.out.println("Enter the value of d");
d = in.nextInt();
System.out.println("Enter the value of m");
m = in.nextInt();
System.out.println("Enter the value of n");
n = in.nextInt();
/* Checking if denominator is zero
*/
if ( (a * d) - (c * b) == 0){
System.out.println("Error: ad - cb = 0");
}
else{
x1 = ((m * d) - (b * n)) / ((a* d) - (c*d));
x2 = ((n * a) - (m* c)) / ((a* d) - (c*d));
/* Printing out results
*/
System.out.println("The value of x1 = " + x1);
System.out.println("The value of x2 = " + x2);
}
}
}
/* 6.9
* Admission to a professional course is subject to the following conditions:
* (a) Marks in mathematics >= 60
* (b) Marks in physics >= 50
* (c) Marks in chemistry >= 40
* (d) Marks in all three subjects >= 200
* ( or )
* Total in mathematics and phhysics >= 150. Given the marks in three subjects,
* write a program to process the applications to list the eligible candidates
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_9;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Declaring variables
*/
int physics;
int chemistry;
int mathematics;
int total;
int total_math_phy;
/* Declaring scanner
*/
Scanner in = new Scanner (System.in);
/* Taking input from user
*/
System.out.println("Enter marks for physics");
physics = in.nextInt();
System.out.println("Enter marks for chemistry");
chemistry = in.nextInt();
System.out.println("Enter marks for mathemetics");
mathematics = in.nextInt();
/* Calculating total
*/
total = physics + chemistry + mathematics;
total_math_phy = physics + mathematics;
/* Checking if candidate is eligible or not
*/
if (((physics >= 50) && (chemistry >= 40) && (mathematics >= 60) && (total >= 20))
|| (total_math_phy >= 150)){
System.out.println("The candidate is eligible");
}
else{
System.out.println("The candidate is not eligible");
}
}
}
/* 6.13.a
* Write a program that will read the value of x and evaluate the following function
* { 1 for x > 0
* y = { 0 for x = 0
* { -1 for x < 0
* (a) nested if statements
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_13;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x;
int y;
Scanner in = new Scanner(System.in);
System.out.println("Enter the value of x");
x = in.nextInt();
y = 1;
if ( x <= 0){
y = 0;
if ( x < 0){
y = -1;
}
}
System.out.println("y = " + y);
}
}
/* 6.13.b
* Write a program that will read the value of x and evaluate the following function
* { 1 for x > 0
* y = { 0 for x = 0
* { -1 for x < 0
* (b) else if statements
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_13_b;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x;
int y;
Scanner in = new Scanner(System.in);
x = in.nextInt();
/* Using if else statement
*/
if ( x > 0){
y = 1;
}
else if ( x < 0){
y = -1;
}
else{
y = 0;
}
System.out.println("y = " + y);
}
}
/* 6.13.b
* Write a program that will read the value of x and evaluate the following function
* { 1 for x > 0
* y = { 0 for x = 0
* { -1 for x < 0
* (c) conditional operator ?:.
package pkg6_9_c;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x;
int y;
Scanner in = new Scanner(System.in);
System.out.println("Enter the value of x");
x = in.nextInt();
y = (x > 0) ?(1): ((x < 0) ? (-1): (0));
System.out.println("y = " + y);
}
}
* The following code results in compile time error. Identify the error
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_1;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x = 123456;
float f = 100.12;
System.out.println("Float Value = " + f);
}
}
/* Floating point numbers are treated as doubl-precision quantities. To force
them to be in single-precision mode, we must append f or F to the numbers
float f = 100.12F
or
float f = 100.12f
*/
/* 4.2
* The following code results in compile time error. Identify the error
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_2;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int y;
if (x > 10)
{
y = x;
}
System.out.println("Value of Y = " + y);
}
}
/* Variable x is not defined
*/
/* 4.3
* What modification should be done to the following code so that the value of
* the variable pi is not modifiable
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_3;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* When we define symbolic constatnt they cannot be assigned any other
* value.
* Defining pi as symbolic constants
*/
final float PI = 3.14F;
System.out.println("Value of PI = " + PI);
}
}
/* 4.4
* The following code results in compile time error while storing the value of int
* variable to a byte variable. Identify the problem with the code and provide the
* solution
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_4;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int i = 1234;
/* Byte is only 1 byte whereas int is 4 byte.
* So there will be loss of data
* Hence in order to preserve the data we need to type case it to
* either long, float or double
*/
long b = (long)i;
System.out.println("Value of Byte Variable b = " + b);
}
}
/* 4.5
* Identify the error in the following code:
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg4_5;
/**
*
* @author Azeem
*/
public class Scope {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int m = 10;
{
int m = 20;
}
}
}
/* Variable m is already defined (multiple definition of m) in method Scope
*/
/* 5.1
* In the following code the expected value is 8, but it prints the value 2.What
* would you modify in the code to obtain the expected value ?
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg5_1;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int i = 42 + 45 -48 - 5;
int j = 5 + 5 - 8 + 2;
/* Using division sign instead of modulus
*/
int ans = i / j;
System.out.println("Value of Ans = " + ans);
}
}
/* 5.3
* The following code results in compilation error. Debug the code and rectify
* the problem
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg5_3;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Using arithmetic operators properly
*/
int ans = (2 * (5 - 8) * (5 - 5) + 10) * 2;
System.out.println("Value of Ans = " + ans);
}
}
/* 5.4
* In the code give below what should be changed to obtain the value of 40.0 for
* x
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg5_4;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* rint returns the closest integer value in the argument
* Replacing it with floor which gives the largest integer that is less
* than or equal to the argument.
*/
double x = Math.floor(40.6);
double y = Math.abs(40.6);
System.out.println("Value of X is = " + x + " and Y is = " + y);
}
}
/* 6.1
* Determine whether the following are true or false:
* (a) When if statements are nested, the last else gets associated with the nearest
* if without an else
* Ans: True
* (b) One if can have more than one else clause
* Ans: False
* (c) A switch statement can always be replaced be a series of if..else
* statement
* Ans: True
* (d) A switch expression can be of any type
* Ans: False
* (e) A program stopes its execution when a break statement is encountered
* Ans: False
*/
/* 6.3
* Find errors, if any, in each of the following segments
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_3;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Declaring and initializing variables
*/
int x = 10;
int y = 5;
int z = 8;
/* A conditional operator '==' must be used instead of an
* assignment operator '=' in conditional statemens
*/
if (x + y == z && y > 0){
/* Statements
*/
}
/* Declaring and initializing variables
*/
int a = 10;
int b = 9;
int c = 8;
int code = a + b;
/* If statement ends because of semicolon ';'. Thats fine but else statement
* should immediately follow 'if' statements or it may give a compilation error
* Statements a = b + c and a = 0 should end with a semicolon
*/
if (code > 1)
a = b + c;
else
a = 0;
/* Declaring and initializing variables
*/
int p = 10;
int q = 9;
/* If has no parenthesis which gives compilation error
*/
if ((p < 0) || (q < 0)){
/* Statements
*/
}
}
}
/* 6.6
* Write a program to find the number of and sum of all integers greater than
* 100 and less than 200 that are divisible by 7
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_6;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Initializing variables
*/
int index = 0;
int sum = 0;
int count = 0;
for (index = 100; index <= 200; index++){
/* If the value of index is divisible by 7 then
* Increase count and add that number to sum
*/
if (index % 100 == 0){
count++;
sum = sum + index;
}
}
/* Print out the result
*/
System.out.println("The number of integers dvisible by 7 greater than "
+ "100 but less than 200 is " + count);
System.out.println("The sum of number of integers divisible by 7 greater"
+ " than 100 but less than 200 is " + sum);
}
}
/* 6.7
* A set of two linear equations with two unknown x1 and x2 is given below:
* ax1 + bx2 = m
* cx1 + dx2 = n
* The set has a unique solution
* x1 = (md - bn) / (ad - cd)
* x2 = (na - mc) / (ad - cd)
* provided the denominator ad - cd is not equal to zero
* Write the program that will read the values of constants a, b, c, d, m and n and
* compute the values of x1 and x2.
* An appropriate message shoud be printed if ad - cb = 0
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_7;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Declaring variables
*/
int x1, x2;
int a, b, c, d, m, n;
/* Scanning data from user
*/
Scanner in = new Scanner(System.in);
System.out.println("Enter the value of a");
a = in.nextInt();
System.out.println("Enter the value of b");
b = in.nextInt();
System.out.println("Enter the value of c");
c = in.nextInt();
System.out.println("Enter the value of d");
d = in.nextInt();
System.out.println("Enter the value of m");
m = in.nextInt();
System.out.println("Enter the value of n");
n = in.nextInt();
/* Checking if denominator is zero
*/
if ( (a * d) - (c * b) == 0){
System.out.println("Error: ad - cb = 0");
}
else{
x1 = ((m * d) - (b * n)) / ((a* d) - (c*d));
x2 = ((n * a) - (m* c)) / ((a* d) - (c*d));
/* Printing out results
*/
System.out.println("The value of x1 = " + x1);
System.out.println("The value of x2 = " + x2);
}
}
}
/* 6.9
* Admission to a professional course is subject to the following conditions:
* (a) Marks in mathematics >= 60
* (b) Marks in physics >= 50
* (c) Marks in chemistry >= 40
* (d) Marks in all three subjects >= 200
* ( or )
* Total in mathematics and phhysics >= 150. Given the marks in three subjects,
* write a program to process the applications to list the eligible candidates
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_9;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
/* Declaring variables
*/
int physics;
int chemistry;
int mathematics;
int total;
int total_math_phy;
/* Declaring scanner
*/
Scanner in = new Scanner (System.in);
/* Taking input from user
*/
System.out.println("Enter marks for physics");
physics = in.nextInt();
System.out.println("Enter marks for chemistry");
chemistry = in.nextInt();
System.out.println("Enter marks for mathemetics");
mathematics = in.nextInt();
/* Calculating total
*/
total = physics + chemistry + mathematics;
total_math_phy = physics + mathematics;
/* Checking if candidate is eligible or not
*/
if (((physics >= 50) && (chemistry >= 40) && (mathematics >= 60) && (total >= 20))
|| (total_math_phy >= 150)){
System.out.println("The candidate is eligible");
}
else{
System.out.println("The candidate is not eligible");
}
}
}
/* 6.13.a
* Write a program that will read the value of x and evaluate the following function
* { 1 for x > 0
* y = { 0 for x = 0
* { -1 for x < 0
* (a) nested if statements
*/
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_13;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x;
int y;
Scanner in = new Scanner(System.in);
System.out.println("Enter the value of x");
x = in.nextInt();
y = 1;
if ( x <= 0){
y = 0;
if ( x < 0){
y = -1;
}
}
System.out.println("y = " + y);
}
}
/* 6.13.b
* Write a program that will read the value of x and evaluate the following function
* { 1 for x > 0
* y = { 0 for x = 0
* { -1 for x < 0
* (b) else if statements
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package pkg6_13_b;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x;
int y;
Scanner in = new Scanner(System.in);
x = in.nextInt();
/* Using if else statement
*/
if ( x > 0){
y = 1;
}
else if ( x < 0){
y = -1;
}
else{
y = 0;
}
System.out.println("y = " + y);
}
}
/* 6.13.b
* Write a program that will read the value of x and evaluate the following function
* { 1 for x > 0
* y = { 0 for x = 0
* { -1 for x < 0
* (c) conditional operator ?:.
package pkg6_9_c;
import java.util.Scanner;
/**
*
* @author Azeem
*/
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
int x;
int y;
Scanner in = new Scanner(System.in);
System.out.println("Enter the value of x");
x = in.nextInt();
y = (x > 0) ?(1): ((x < 0) ? (-1): (0));
System.out.println("y = " + y);
}
}
