java practice set 2

package com.company;

import java.util.Scanner;

public class cwh_chapter2_practice_set {

    public static void main(String[] args) {

        //exercise1

        float a=7/4*9/2;//    4.0

        float b=7/4.0f*9/2.0f;//     7.875

        System.out.println(a);

        System.out.println(b);

        //exercise2

        char grade = 'B';

        grade = (char) (grade + 8);//typecasting -----encrypted

        System.out.println(grade);

        grade = (char) (grade - 8);//typecasting -----dencrypted

        System.out.println(grade);

        //exercise3

        Scanner sc = new Scanner(System.in);

        int c =sc.nextInt();

        System.out.println(c>8);

        System.out.println(7*49/7+35/7);

    }

}