Chapter 2- Practice Set (Java Practice Questions And Answers)

Questions :

1.  What will be the result of the following expression: 

float a = 7/4 * 9/2

2.  Write a java program to encrypt a grade by adding 8 to it. 

Decrypt it to show the correct grade.
Use comparison operators to find out whether a given number is greater than the user entered number or not.
Write the following expression in a java program:
v2-u2/2as

3.  Find the value of the following expression:
int x = 7
int a = 7*49/7 + 35/7
Value of a?

4.  Write the following expressions in java Program :

v2-u2/2as

5.  Find the value of following Expressions:

int x=7;

int a=7*49/7+35/7;

value of a?

Code Solution:

// Question -1 Answer

package com.company;

public class cwh_12_ps2_pr01 {
    public static void main(String[] args) {
        float a = 7/4.0f * 9/2.0f;
        // float a=1.75*9/2;
        // float a=15.75/2; (associativity left to right)
        // float a=7.875;
        System.out.println(a);
    }
}
/*
7.875
*/


/*
float a=7/4*9/2;   // float a=1*9/2; float a=9/2; float a=4;
System.out.println(a);

answer = 4
*/

// Question -2 Answer

package com.company;

public class cwh_12_ps2_pr02 {
    public static void main(String[] args) {
        char grade = 'B';
        grade = (char)(grade + 8);
        System.out.println(grade);   // Output : J
        // Decrypting the grade
        grade = (char)(grade - 8);
        System.out.println(grade);   // Output : B
    }
}

// Question 3- Answer

package com.company;
import java.util.Scanner;

public class cwh_12_ps2_pr_03 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        System.out.println(a>8);     
        
    }
}
/*
99
true

3
false

*/

// Question 4- Answer
package com.company;
import java.util.Scanner;
public class chapter2answer {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the value of v :");
        float v=sc.nextFloat();
        System.out.println("Enter the value of u");
        float u=sc.nextFloat();
        System.out.println("Enter the value of a");
        float a=sc.nextFloat();
        System.out.println("Enter the value of s");
        float s=sc.nextFloat();
        float ans=(v*v-u*u)/(2*a*s);
        System.out.println(ans);

    }
}

/*
Enter the value of v :
5
Enter the value of u
6
Enter the value of a
2
Enter the value of s
3
-0.9166667
 */

  // Question 5- Answer
package com.company;
public class chapter2answer {
    public static void main(String[] args) {
        int a=7*49/7+35/7;
        System.out.println(a);

    }
}

/*
54
 */