编程题；从键盘上输入1至7之间的整数，输入1输出星期一，输入二输出星

#include void main(){ int a; printf("请输入整数："); scanf("%d",a); switch(a){ case 1: printf("星期一");break; case 2: printf("星期二");break; case 3: printf("星期三");break; case 4: printf("星期四");break; case 5: printf("星期五");break; case 6: printf("星期六");break; case 7:printf("星期日");break; default: printf("输入整数错误");}}

输入1到7之间的值，输出星期几，其它值则退出程序。
c 语言程序如下：
#include
int main()
{
char s[8][16]={" ","Monday","Tuesday","Wednesday",
"Thursday","Friday","Saturday","Sunday" };
int i;
while(1){
printf("input one int value between 1 to 7, other value exit:");
scanf("%d",&i);
if (i<=0 || i>7) return 0;
printf("%s\n\n",s[i]);
}
return 0;
}