Simple Addition, Division and multiplication Calculator in C

calc.c

#include <stdio.h>

double operate(char opr, double num1, double num2)
{
    if (opr == 'a')
        return num1 + num2;

    if (opr == 's')
        return num1 - num2;

    if (opr == 'm')
        return num1 * num2;

    printf("Invalid operation.\n");
    return 0.0;
}

int main()
{
    double num1, num2;
    char operation;

    printf("Enter the First number:\n");
    scanf("%lf", &num1);

    // Clear the newline left by previous scanf
    getchar();

    printf("Enter Operator \n a: ADD \n s: Subtract \n m: Multiply\n");
    scanf("%c", &operation);

    printf("Enter the second number:\n");
    scanf("%lf", &num2);

    double result = operate(operation, num1, num2);
    printf("RESULT: %lf\n", result);

    return 0;
}