#include <stdio.h>

int main() {
    char choice;

    while (1) {
        printf("\n                                 1.Input\n");
        printf("                                 2.Output\n");
        printf("                                 3.Order\n");
        printf("                                 4.Quit\n");

        scanf(" %c", &choice);

        switch (choice) {
            case 'i':
                printf("You are trying to Input info\n");
                break;
            case 'o':
                printf("You are trying to Output info\n");
                break;
            case 'm':
                printf("You are trying to Make things ordered\n");
                break;
            case 'q':
                printf("You are about to Quit\n");
                return 0; //Í˳ö³ÌÐò
            default:
                printf("Wrong input\n");
        }
    }

    return 0;
}