#include <stdio.h>
 
int main() {
    float num1, num2, result;
    char op;
 
    printf("Enter an arithmetic expression (e.g., 12 + 5): ");
    scanf("%f %c %f", &num1, &op, &num2);
 
    switch (op) {
        case '+':
            result = num1 + num2;
            printf("Result: %.2f\n", result);
            break;
        case '-':
            result = num1 - num2;
            printf("Result: %.2f\n", result);
            break;
        case '*':
            result = num1 * num2;
            printf("Result: %.2f\n", result);
            break;
        case '/':
            if (num2 != 0)
                printf("Result: %.2f\n", num1 / num2);
            else
                printf("Error: Division by zero is not allowed.\n");
            break;
        case '%':
            // Modulus only works with integers
            if ((int)num2 != 0)
                printf("Result: %d\n", (int)num1 % (int)num2);
            else
                printf("Error: Division by zero in modulus.\n");
            break;
        default:
            printf("Invalid operator! Use +, -, *, /, or %%\n");
    }
 
    return 0;
}