Write a program to create menu for following operators : + , - , * , / .

 

// Program to create a simple calculator

#include <stdio.h>

int main() {

    char operator;

    double n1, n2;

    printf("Enter an operator (+, -, *, /): ");

    scanf("%c", &operator);

    printf("Enter two operands: ");

    scanf("%lf %lf",&n1, &n2);

    switch(operator)

    {

        case '+':

            printf("%.1lf + %.1lf = %.1lf",n1, n2, n1+n2);

            break;

        case '-':

            printf("%.1lf - %.1lf = %.1lf",n1, n2, n1-n2);

            break;

        case '*':

            printf("%.1lf * %.1lf = %.1lf",n1, n2, n1*n2);

            break;

        case '/':

            printf("%.1lf / %.1lf = %.1lf",n1, n2, n1/n2);

            break;

        // operator doesn't match any case constant +, -, *, /

        default:

            printf("Error! operator is not correct");

    }

    return 0;

}

output 1 :

Enter an operator (+, -, *, /): * Enter two operands: 23 56 23.0 * 56.0 = 1288.0

output 2 :

Enter an operator (+, -, *, /): /

Enter two operands: 45

5

45.0 / 5.0 = 9.0