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Java program for Calculator - Design calculator with arithmetic operators

Java Program for Calculator

This program will read two integer numbers and calculate the arithmetic operators, in this example we used switch case and if else statement. User will enter a choice after entering two numbers and based on user choice program will return the result.

Calculator Example using Java Program

/*Java program for Calculator.*/
 
import java.util.*;
 
public class Calculator{
 
     public static void main(String []args){
         int a,b,choice;
         float result=0;
         /*scanner class object to read values*/
         Scanner buf=new Scanner(System.in); 
          
         System.out.print("Enter first number: ");
         a=buf.nextInt();
         System.out.print("Enter second number: ");
         b=buf.nextInt();
          
         System.out.print("\n1: Addition.\n2: Subtraction.");
         System.out.print("\n3: Multiplication.\n4: Divide.");
         System.out.print("\n5: Remainder.\n6: Exit.");
          
         System.out.print("\nEnter your choice: ");
         choice=buf.nextInt();
          
         switch(choice)
         {
             case 1:
                 result=(a+b); break;
             case 2:
                 result=(a-b); break;
             case 3:
                 result=(a*b); break;
             case 4:
                 result=(float)((float)a/(float)b); break;
             case 5:
                 result=(a%b); break;
             default:
                 System.out.println("An Invalid Choice!!!\n");
         }
         if(choice>=1 && choice<=5)
            System.out.println("Result is: " + result);
          
     }
}

Output

    
    First Run:
    me@linux:~$ javac Calculator.java 

    me@linux:~$ java Calculator 
    Enter first number: 10
    Enter second number: 20 

    1: Addition.
    2: Subtraction. 
    3: Multiplication.
    4: Divide.
    5: Remainder. 
    6: Exit.
    Enter your choice: 4
    Result is: 0.5

    Second Run:
    me@linux:~$ java Calculator 
    Enter first number: 10
    Enter second number: 7

    1: Addition.
    2: Subtraction. 
    3: Multiplication.
    4: Divide.
    5: Remainder. 
    6: Exit.
    Enter your choice: 5
    Result is: 3.0

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