//menu
#include<stdio.h>
void printf_chose(char chose);
int main(int argc,char *argv[])
{
    char chose;
    printf_chose(chose);
   
}
void printf_chose(char chose)
{
    printf("Wellcome!chose(1-4;4 to quit)\n");
    while(1)
    {
        scanf("%d",&chose);
        if(chose==4)
        {
            printf("Bye!\n");
            break;
        }
        if(chose<0||chose>4)
        {
            printf("Please input again attention olny 1-4:\n");
            continue;
        }
        switch(chose)
        {
            case 1: printf("1\n");
                break;
            case 2: printf("2\n");
                break;
            case 3: printf("3\n");
                break;
        }
    }
}