习题5.5

#include <stdio.h>#include <stdlib.h>int main(){   int year,flag;   printf("enter year:");   scanf("%d",&year);   if((year%4==0&&year%100!=0)||(year%4==0))    flag=1;   else    flag=0;    if(flag=1)    printf("%d is a leap year!\n",year);   else    printf("%d is not a leap year!\n",year);   return 0;}

知识点
关系运算符，if,else的条件语句
心得体会
多运算，多编程，加油