使用C语言，编程实现以下功能

编程实现以下功能，从键盘输入一个整数若输入数字0则屏幕显示：sunday，若输入数字1，则屏幕显示：monday，以此类推，若输入数字不在0到6范围内，则原样输出该数字

#include <stdio.h>

const char week_name[][9] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

int main(int argc, char **argv)
{
	int day = 0;
	while(1)
	{
		printf("%s\n","请输入数字:" );
		scanf("%d",&day);
		if(0 <= day && day <= 6)
		{
			printf("%s\n",week_name[day]);
		}
		else
		{
			printf("%d\n",day);
		}
	}
	return 0;
}

#include <stdio.h>
int main()
{
    int a;
    scanf("%d",&a);
    switch(a)
    {
        case 0:printf("sunday\n");
            break;
        case 1:printf("monday\n");
            break;
        case 2:printf("tuesday\n");
            break;
        case 3:printf("wednesday\n");
            break;
        case 4:printf("thursday\n");
            break;
        case 5:printf("friday\n");
            break;
        case 6:printf("saturday\n");
        default:printf("%d\n",a);
    }
    return 0;
}