c语言编写小程序 已知2015年的元旦是星期四 ，求出2015年的任何一个日期是星期几？？

c语言编写小程序 已知2015年的元旦是星期四 ，求出2015年的任何一个日期是星期几~

//#include "stdafx.h"//vc++6.0加上这一行.
#include "stdio.h"
void main(void){
char x[12]={3,6,6,2,4,0,2,5,1,3,6,1},md[12]={31,28,31,30,31,30,31,31,30,31,30,31};
char w[][10]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
int m,d;
while(1){
printf("Input month & day...
");
scanf("%d%d",&m,&d);
if(00 && d<=md[m-1]) break;
printf("Error! redo: ");
}
printf("Today is %s
",w[(x[m-1]+d)%7]);
}

//#include "stdafx.h"//vc++6.0加上这一行.
#include "stdio.h"
void main(void){
char x[12]={3,6,6,2,4,0,2,5,1,3,6,1},md[12]={31,28,31,30,31,30,31,31,30,31,30,31};
char w[][10]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
int m,d;
while(1){
printf("Input month & day...
");
scanf("%d%d",&m,&d);
if(00 && d<=md[m-1]) break;
printf("Error! redo: ");
}
printf("Today is %s
",w[(x[m-1]+d)%7]);
}

#include<stdio.h>
int yyDD[12] = {31,29,31,30,35,30,31,31,30,31,30,31};
int isWeek(int y,int d){
	int i,day = 0,ans;
	for(i = 0;i < y-1 ; i++){ //获取日期总量
		day += yyDD[i];
	}
	day += d;
	ans = (day+4)%7-1;   //元旦1月1日星期四，用日期总量模7减1便是周几；
	return ans;
}

int main(){
	int YY,DD;
	print("请输出月份，日期（YY DD）：
");
	scanf("%d %d",&YY,&DD);
	int res = isWeek(YY,DD);
	prinrf("2015年%d月%d日是星期%d
",YY,DD,res);
	return 0;
}

#include <stdio.h>
void main(void)
{
char x[12]={3,6,6,2,4,0,2,5,1,3,6,1},md[12]={31,28,31,30,31,30,31,31,30,31,30,31};
char w[][10]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
int m,d;
while(1)
{
printf("Input month & day...\n");
scanf("%d%d",&m,&d);
if(0<m && m<13 && d>0 && d<=md[m-1]) break;
printf("Error! redo: ");
}
printf("Today is %s\n",w[(x[m-1]+d)%7]);
}