Basic Calculator.c

#include<stdio.h>

int main()
{
    double num1, num2, value;
    char sign;

    printf("Please enter a basic math expression following two numbers: ");
    scanf("%lf %c %lf", &num1, &sign, &num2);

    if (sign == '+')
        value = num1 + num2;
    else if (sign == '-')
        value = num1 - num2;
    else if (sign == '*')
        value = num1 * num2;
    else if (sign == '/')
        value = num1 / num2;
    else
    {
        printf("\n Input is INVALID! \n Error : %d \n Try : 25 + 25 \n", 420);
        return 0;
    }

    printf("%lf %c %lf = %lf\n", num1, sign, num2, value);

    return 0;
}