C语言：输入年月日，输出这是这一年的第几天

#include
#include
void Divisible() {
	int i;
	printf("请输入一个整数n");
	scanf_s("%d", &i);
	if (i % 5 == 0 && i % 7 == 0) {
		printf("Yesn");
	}
	else { printf("Non"); }
}
void Day() {
	
	int a,b,c,d;
	printf("请输入某年某月某日n");
	scanf_s("%d%d%d", &a ,& b ,& c);
	if (a % 400 == 0 || a % 4 == 0) {
		c = 29;
	}
	else{
		c = 28;
	}
	if (b == 8) {
	d = (b - 1) * 31 + c;
		printf("这是%d年的第%d天n", a, d);
	} 
	else if (b % 2 == 1) {
		d = (b - 1) * 31 + c;
		printf("这是%d年的第%d天n", a, d);
	}
	else {
		d = (b - 1) * 30 + c;
		printf("这是%d年的第%d天n", a, d);
	}
	system("pause");
}
int main(){
	Divisible();
	Day();
	return 0;
}