Manchester- C语言程序设计教程（第三版）课后习题11.1

#include<iostream>
int main(int argc, char *argv[]){
	int year,month,day;
	int sum = 0;
	std::cin>>year>>month>>day;
	if((year%4==0 && year%100!=0) || (year%400==0)){
		sum+=1;
	}
	for(int i = 1; i<month; i++){
		if(i==1 || i==3 || i==5 || i==7 || i==8 || i == 10 || i==12){
		sum+=31;
	}
	else if(i == 2){
		sum+=28;
	}
	else{
		sum+=30;
	}
	}
	sum+=day;
	std::cout<<sum;
}

#include<stdio.h>
int leap_year(int y);
struct year {
	int tear;
	int yue;
	int ru;
}temp;
int main()
{
	int t=0,a=0;
	int b[12] = {31,29,31,30,31,30,31,31,30,31,30,31};
	int c[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
	scanf_s("%d%d%d",&temp.tear,&temp.yue,&temp.ru);
	t = leap_year(temp.tear);
	if (t == 1)
		for (int i = 0; i < temp.yue-1; i++)
			a += c[i];
		if (t == 0)
			for (int i = 0; i < temp.yue - 1; i++)
				a += b[i];
	printf("%d",temp.ru+a);
	return 0;
}


int leap_year(int y)
{
	if ((y % 400 == 0 || (y % 100 != 0 && y % 4 == 0)))
		return 0;
	else
		return 1;
}
欢迎点评

这不是cpp吗

#include <stdio.h>

struct Time
{
    int year;
    int month;
    int day;
};

int main(void)
{
    struct Time time;
    int i, year, month, day;
    int sum = 0;
    int y[12] = {31,28,31,30,31,30,31,31,30,31,30,31};

    scanf("%d%d%d", &time.year, &time.month, &time.day);

    sum = time.day;

    for (i = 0; i < time.month - 1; i++)
    {
        sum += y[i];
    }

    if ((time.year % 400 == 0) || (time.year % 4 == 0 && time.year % 100 != 0) && (time.month > 2))
       printf("%d", sum + 1);
    else
        printf("%d", sum);

    return 0;
}

有大佬帮忙看一下哪里错了吗？错误50%
#include <iostream>
using namespace std;
struct Data
{
	int year;
	int month;
	int day;
};
int main()
{
	Data time;
	int a[12]={31,28,31,30,31,30.31,31,30,31,30,31},day=0;
	cin>>time.year>>time.month>>time.day;
	if((time.year%4==0&&time.year%100!=0)||time.year%400==0)
        a[1]=29;
	for(int i=0;i<time.month-1;i++)
		day=day+a[i];
	day=day+time.day;
	cout<<day<<endl;
	return 0;
}

#include <stdio.h>
int main()
{	
		struct dd
	{
		int year;
		int month;
		int day;
	}st1;
	int sum = 0;
	int a[][13]={
		{0,31,28,31,30,31,30,31,31,30,31,30,31},
		{0,31,29,31,30,31,30,31,31,30,31,30,31}
	};
	scanf ("%d%d%d",&st1.year,&st1.month,&st1.day);
	int leap = 0;
	leap =  ( st1.year % 4 == 0 && st1.year %100 != 0 || st1.year % 400 == 0 );
	while ( st1.month > 0){
			st1.month--;
			sum += a[leap][st1.month];
	}
	sum += st1.day;
	printf("%d",sum);
}

#include<stdio.h>
struct date{
	int year;
	int month;
	int day;
}aa;

void main(){
	int a[12]={31,28,31,30,31,30,31,31,30,31,30,31},t=0;
	scanf("%d%d%d",&aa.year,&aa.month,&aa.day);
	if(aa.year%100==0&&aa.year%400==0||aa.year%100!=0&&aa.year%4==0){
		a[1]=29;
	}
	for(int i=0;i<aa.month-1;i++){
		t=t+a[i];
	}
	printf("%d\n",t+aa.day);
}

#include <stdio.h>
int main(int argc, char *argv[]) 
{
	int year,month,date,lun,days;
	scanf("%d%d%d",&year,&month,&date);         //輸入年月日 
	lun=(year%4 == 0);                          //适当的运用返回值1 
	switch(month)                            
	{
		case 12:days+=30;
		case 11:days+=31;
		case 10:days+=30;
		case 9:days+=31;
		case 8:days+=31;
		case 7:days+=30;
		case 6:days+=31;
		case 5:days+=30;
		case 4:days+=31;
		case 3:days+=28+lun;                     //利用lun来判断是否闰年，如是，则返回1；如不是，lun则等于0 
		case 2:days+=31;                        //如果不是一月的話再加一月的天数 
		case 1:days+=date;break;