#include<stdio.h> int main() { printf(" 1.Input\n");//步骤一; printf(" 2.Output\n"); printf(" 3.Order\n"); printf(" 4.Quit\n"); char a; scanf("%c",&a); switch (a) { case 'i':printf("You are trying to Input info");break; case 'o':printf("You are trying to Output info");break; case 'm':printf("You are trying to Make things ordered");break; case 'q':printf("You are trying to Quit");break; default:printf("Wrong input"); return 0; } }