Ex6.2

#include <stdio.h>

int main () {
    float a, b;
    char op;
    printf("%*s%s%-*s\n\n", 10, ".:: ", "Simple Calculator", 10, " ::.");
    printf("> Enter a simple expression (e.g: 1 + 2): ");
    if (!scanf("%f %c %f", &a, &op, &b)) {
        printf("You entered an invalid expression.");
        return 0;
    }
    while (getchar() != '\n');
    printf("\n> ");
    switch (op) {
        case '+':
            printf("%.2f %c %.2f = %.2f\n", a, op, b, a + b);
            break;
        case '-':
            printf("%.2f %c %.2f = %.2f\n", a, op, b, a - b);
            break;
        case '/':
            printf("%.2f %c %.2f = %.2f\n", a, op, b, a / b);
            break;
        case '*':
            printf("%.2f %c %.2f = %.2f\n", a, op, b, a * b);
            break;
        case '%':
            printf("%d %c %d = %d\n", (int) a, op, (int) b, (int)a % (int)b);
            break;
        default:
            printf("The operator you entered is invalid or not supported (support: + - * / %).\n");
    }
    return 0;
}