输入年月日判断输入的日期是当前的第几天

#include<stdio.h>

int main(void)
{
	int year,month,day;
	int i,j;
	int num=0;
	int a[12]={31,28,31,30,31,30,31,31,30,31,30,31};
	int b[12]={31,29,31,30,31,30,31,31,30,31,30,31};
	bool x;
	printf("请输入年月日\n");
	scanf("%d %d %d",&year,&month,&day);
	if((year%4==0)&&(year%100!=0) || (year%4==0)&&(year%400)==0)
		x=true;
	else
		x=false; 
	if(x)
	{
		for(i=0;i<month;i++)
			num+=b[i];
		num+=day; 
	}
	else
	{
		for(j=0;j<month;j++)
			num+=a[j];
		num+=day;
	}
	printf("今天是%d年的第%d天\n",year,num);
	return 0;
}