#include <stdio.h> int main() { // red, yellow, green int red = 0, yellow = 1, green = 2;

int light = red; 

switch (light) 
{ 
case red: 
    printf("红灯，请停止"); 
    break; 

case yellow: 
    printf("黄灯，请减速"); 
    break; 

case green: