Description

Menu driven program means the code will calculate based on operator until
exit condition not given. Here program will run until user will give valid
operator as input.
In this program, user will enter operator(+,-,*,/) and two operands.
It will give output based on entered operator.

C/C++

/* C Program of Menu Driven Simple Calculator Using If Else */
//Save it as MenuDrivenSimpleCalculatorUsingIfElse.c

#include<stdio.h>
int main(){
    
    //Program will run until the condition will  true
    while(1){

        double firstNumber, secondNumber;
        char op;

        printf("Enter the operation");
        printf("\nFor addition + ");
        printf("\nFor subtraction - ");
        printf("\nFor multiplication * ");
        printf("\nFor division / ");
        printf("\nAny other key for exit : ");
        
        //Taking operator as character as input
        //Give space before scanning of character to avoid termination of programm
        scanf(" %c",&op);
        
        //checking if entered character is any valid operator or not
        if(op == '+' || op == '-' || op == '*' || op == '/') {

            printf("Enter the first number : ");
            scanf("%lf",&firstNumber);

            printf("Enter the second number : ");
            scanf("%lf",&secondNumber);

            if(op == '+') {
                printf("The summation of %lf and %lf = %lf\n",firstNumber,secondNumber,(firstNumber+secondNumber));
            }else if(op == '-') {
                printf("The subtraction of %lf and %lf = %lf\n",firstNumber,secondNumber,(firstNumber-secondNumber));
            }else if(op == '*') {
                printf("The multiplication of %lf and %lf = %lf\n",firstNumber,secondNumber,(firstNumber*secondNumber));
            }else if(op == '/') {
                printf("The division of %lf and %lf = %lf\n",firstNumber,secondNumber,(firstNumber/secondNumber));
            }else{
                printf("Invalid Input");
            }
        }
        
        //Program will terminate if no valid operator given as input
        else {
            printf("Successful exit");
            break;
        }
    }

    return 0;
}

Input:
Enter the operation
For addition + 
For subtraction - 
For multiplication * 
For division / 
Any other key for exit : 
+
Enter the first number : 
4
Enter the second number : 
8
The summation of 4.0 and 8.0 = 12.0
Enter the operation
For addition + 
For subtraction - 
For multiplication * 
For division / 
Any other key for exit : 

Output:
The summation of 4.0 and 8.0 = 12.0

Java

/* Java Program of Menu Driven Simple Calculator Using If Else */
//Save it as MenuDrivenSimpleCalculatorUsingIfElse.java

import java.io.*;
import java.util.Scanner;

public class MenuDrivenSimpleCalculatorUsingIfElse {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        
        //Program will run until the condition will  true
        while (true) {

            System.out.println("Enter the operation");
            System.out.println("For addition + ");
            System.out.println("For subtraction - ");
            System.out.println("For multiplication * ");
            System.out.println("For division / ");
            System.out.println("Any other key for exit : ");
            
            //Taking operator as character as input
            char op = scanner.next().charAt(0);
            
            //checking if entered character is any valid operator or not
            if (op == '+' || op == '-' || op == '*' || op == '/') {
                System.out.println("Enter the first number : ");
                double firstNumber = scanner.nextDouble();
                System.out.println("Enter the second number : ");
                double secondNumber = scanner.nextDouble();
                if (op == '+') {
                    System.out.println("The summation of " + firstNumber + " and " + secondNumber + " = "
                            + (firstNumber + secondNumber));
                } else if (op == '-') {
                    System.out.println("The subtraction of " + firstNumber + " and " + secondNumber + " = "
                            + (firstNumber - secondNumber));
                } else if (op == '*') {
                    System.out.println("The multiplication of " + firstNumber + " and " + secondNumber + " = "
                            + (firstNumber * secondNumber));
                } else if (op == '/') {
                    System.out.println("The division of " + firstNumber + " and " + secondNumber + " = "
                            + (firstNumber / secondNumber));
                }else {
                    System.out.println("Please enter valid operator");
                }
            
            //Program will terminate if no valid operator given as input
            } else {
                System.out.println("Successful exit");
                break;
            }
        }
    }
}

Input:
Enter the operation
For addition + 
For subtraction - 
For multiplication * 
For division / 
Any other key for exit : 
+
Enter the first number : 
4
Enter the second number : 
8
The summation of 4.0 and 8.0 = 12.0
Enter the operation
For addition + 
For subtraction - 
For multiplication * 
For division / 
Any other key for exit : 

Output:
The summation of 4.0 and 8.0 = 12.0

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