加入双重非法判断的判断是否为闰年（优化版）
目录：程序员成长之旅/C语言/自己写的源码
#include<stdio.h>
int main()
{
int year, Num, Error1;
printf("Please enter year(1600~9999):\n");
Error1 = scanf("%d", &year);
if (year >= 1600 & year <= 9999)
{
if (year % 4 == 0)
{
if (year % 100 == 0)
{
if (year % 400 == 0)
{
Num = 1;
}
else
{
Num = 0;
}
}
else
{
Num = 1;
}
}
else
{
Num = 0;
}
if (Num)
{
printf("[%d] is ", year);
}
else
{
printf("[%d] is not ", year);
}
printf("a leap year!");
}
else
{
if (Error1!= 0)
{
printf("You enter nummber [%d] is Error!!", year);
}
else
{
printf("You enter data is Error!!");
}
}
return 0;
}