计算某年某月某日是该年的第几天【算法入门】

计算某年某月某日是该年的第几天

#include <stdio.h>int leap(int a){    if(a%4&&a%100!=0||a%400==0)        return 1;    else        return 0;}int number(int year,int m,int d){    int sum=0,i,k,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};    if(leap(year)==1)    {        for(i=0;i<m-1;i++)            sum+=b[i];    }else    for(i=0;i<m-1;i++)        sum+=a[i];    sum+=d;    return sum;}int main(){    int year,month,day,n;    printf("请输入年月日\n");    scanf("%d%d%d",&year,&month,&day);    n=number(year,month,day);    printf("第%d天\n",n);}