Description

In this program, user will enter operator(+,-,*,/) and two operands.
It will give output based on entered operator.

C/C++

/* C Program of Simple Calculator Using If Else */
//Save it as SimpleCalculatorUsingIfElse.c

#include<stdio.h>
int main(){

    double firstNumber, secondNumber;
    char op;

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

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

    printf("Enter the operation");
    printf("\nFor addition + ");
    printf("\nFor subtraction - ");
    printf("\nFor multiplication * ");
    printf("\nFor division / : ");
    scanf(" %c",&op);

    if(op == '+') {
        printf("The summation of %lf and %lf = %lf",firstNumber,secondNumber,(firstNumber+secondNumber));
    }else if(op == '-') {
        printf("The subtraction of %lf and %lf = %lf",firstNumber,secondNumber,(firstNumber-secondNumber));
    }else if(op == '*') {
        printf("The multiplication of %lf and %lf = %lf",firstNumber,secondNumber,(firstNumber*secondNumber));
    }else if(op == '/') {
        printf("The division of %lf and %lf = %lf",firstNumber,secondNumber,(firstNumber/secondNumber));
    }else{
        printf("Invalid Input");
    }

    return 0;
}

Input:
Enter the first number : 
7
Enter the second number : 
6
Enter the operation
For addition + 
For subtraction - 
For multiplication * 
For division / : 
*

Output:
The multiplication of 7.0 and 6.0 = 42.0

Java

/* Java Program of Simple Calculator Using If Else */
//Save it as SimpleCalculatorUsingIfElse.java

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

public class SimpleCalculatorUsingIfElse {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter the first number : ");
        double firstNumber = scanner.nextDouble();
        
        System.out.println("Enter the second number : ");
        double secondNumber = scanner.nextDouble();
        
        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 / : ");
        
        char op = scanner.next().charAt(0);
        
        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("Invalid Input");
        }
    }
}

Input:
Enter the first number : 
7
Enter the second number : 
9
Enter the operation
For addition + 
For subtraction - 
For multiplication * 
For division / : 
+

Output:
The summation of 7.0 and 9.0 = 16.0

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