#include <stdio.h>

int main() {
    char operator;
    double num1 = 10, num2 = 20, result;

    printf("Enter an operator (+, -, *, /,): ");
    scanf(" %c", &operator);

    switch (operator) {
        case '+':
            result = num1 + num2;
            printf("Result: %.2lf + %.2lf = %.2lf\n", num1, num2, result);
            break;

        case '-':
            result = num1 - num2;
            printf("Result: %.2lf - %.2lf = %.2lf\n", num1, num2, result);
            break;

        case '*':
            result = num1 * num2;
            printf("Result: %.2lf * %.2lf = %.2lf\n", num1, num2, result);
            break;

        case '/':
            if (num2 != 0)
                printf(