Data Type with Arithmetic Operator in Java

/*
 * 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 jv.arith;
/**
 * Arithmetic identification in java
 * @author sm rabbi
 */
public class JvArith {
   //Demonstrate the basic arithmetic operators
    public static void main(String[] args) {
                // arithmetic usings integers
                System.out.println("Integer Arithmetic");
                int a=1+1;
                int b=a*3;
                int c=b/4;
                int d=c-a;
                int e=-a;
                System.out.println("a= "+a);
                System.out.println("b="+b);
                System.out.println("c="+c);
                System.out.println("d="+d);
                System.out.println("e="+e);
                //arithmatic using doubles
                System.out.println("\nFloatig Piont Arithmetic");
                double m=1+1;
                double n=m*3;
                double o=n/4;
                double p=o-m;
                double q=-p;
                System.out.println("m="+m);
                System.out.println("n="+n);
                System.out.println("o="+o);
                System.out.println("p="+p);
                System.out.println("q="+q);
    }
}

Calculator using java

/*

* Write a C program for performing as calculator which allows all Arithmetic Operators with operands from
* terminal

 */
package cb_pr176;
import java.util.Scanner;
/**
 **
 * @author Arif
 **/
public class Cb_pr176 {
    /*
     * @param args the command line arguments
     */
    public static void main(String[] args) {
    // TODO code application logic here
    Scanner inp=new Scanner(System.in);
    int a,b;
    float c = 0;
    char ch;
    System.out.println("Enter Your 1st number:");
    a=inp.nextInt();
    System.out.println("Enter your 2nd number:");
    b=inp.nextInt();
    System.out.println("Enter your choice, example: +, -, *, /");
    ch=inp.next().charAt(0);
    if (ch=='+')
        c=a+b;
    else if(ch=='-')
        c=a-b;
    else if(ch=='/')
        c=(float)a/(float)b;
    else if(ch=='*')
        c=a*b;
    System.out.println("The Result is:" + c);
         
    }
  }

Java Calculator using instance variable

Design and Write  a simple java class program which can perform all basic operation of a Calculator. Define necessary instance variable but do not use method.

Reference:
1. http://c-programming-sourcecode.blogspot.com/2012/06/write-program-performing-as-calculator.html?q=simple+interest

2. Course Book(The Complete Reference Java j2se) ; Page 106

Source Code:

package calculator_shohan;
import java.util.Scanner;
import java.io.*;
public class Calculator_shohan {
public static void main(String[] args) {
calculator_ c=new calculator_();
int num1=0,num2=0;
Scanner input=new Scanner(System.in);
System.out.println("Enter the first number:");
num1=input.nextInt();
System.out.println("Enter the second number:");
num2=input.nextInt();
c.cal(num1, num2);
}

}
class calculator_
{
int add=0,sub=0,div=0,mul=0,mod=0;
public void cal(int x,int y)
{
Scanner input=new Scanner(System.in);

char ch;
System.out.println("Enter your choice:");
System.out.println("Addition for + :");
System.out.println("Subtraction for - :");
System.out.println("Multiplication for * :");
System.out.println("Divition for /:");
System.out.println("Modulation for %:");
ch=input.next().charAt(0);
switch(ch)
{
case '+':
System.out.println(x+y);
break;

case '-':
System.out.println(x-y);
break;

case '*':
System.out.println(x*y);
break;
case '/':
System.out.println(x/y);
break;
case '%':
System.out.println(x%y);
break;
default:
System.out.println("no choice");
}
}
}