#include<stdio.h>
int main()
{
    int day;
    int day_of_year(2012,5,12);
    printf("%d\n",day);
    return 0;
}
int day_of_year(int year,int month,int day)
{
    int k,leap;//数组初始化
    int tab[2][13]={{0,31,29,31,30,31,30,31,31,30,31,30,31},
    {0,31,29,31,30,31,30,31,31,30,31,30,31}};
    //判断闰年
    leap=(year%4==0&&year%100!=0||year%400==0);
    //计算天数
    for(k=1;k<month;k++)
        day=day+tab[leap][k];
    return day;
}

就这个  请大神看下

大神快来吧  在线等  谢谢啦

Compiling...
数组.cpp
C:\Program Files\Microsoft Visual Studio\MyProjects\练习2\数组.cpp(5) : error C2078: too many initializers
Error executing cl.exe.
这是报错

主函数是不是有问题。

#include<stdio.h>

int day_of_year(int year, int month, int day)
{
    int k, leap;//数组初始化
    int tab[2][13] = { { 0,31,29,31,30,31,30,31,31,30,31,30,31 },
    { 0,31,29,31,30,31,30,31,31,30,31,30,31 } };
    //判断闰年
    leap = (year % 4 == 0 && year % 100 != 0 || year % 400 == 0);
    //计算天数
    for (k = 1; k<month; k++)
        day = day + tab[leap][k];
    return day;
}
int main()
{
    int day;
    day = day_of_year(2012, 5, 12);
    printf("%d\n", day);
    return 0;
}

是顺序的原因吗

#include<stdio.h>

int day_of_year(int year,int month,int day);  //先声明函数

int main()
{
    int day;
    day = day_of_year(2012,5,12); //这里
    
    printf("%d\n",day);
    
    return 0;
}

int day_of_year(int year,int month,int day)
{
    int k,leap;

    int tab[2][13]={{0,31,29,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}};

    leap=(year%4==0&&year%100!=0||year%400==0);

    for(k=1;k<month;k++)
        day=day+tab[leap][k];
    
    return day;
}

#include<stdio.h>
int day_of_year(int year,int month,int day);
int main()
 {
     int day;
     day=day_of_year(2012,5,12);
     printf("%d\n",day);
     return 0;
 }
int day_of_year(int year,int month,int day)
 {
     int k,leap;//数组初始化
    int tab[2][13]={{0,31,29,31,30,31,30,31,31,30,31,30,31},
     {0,31,29,31,30,31,30,31,31,30,31,30,31}};
     //判断闰年
    leap=(year%4==0&&year%100!=0||year%400==0);
     //计算天数
    for(k=1;k<month;k++)
    {
         day=day+tab[leap][k];
    }
     return day;
 }
是因为你将主函数放在被调用函数之后，被调用的函数没有在主函数之前被声明。

任何被调用函数都必须先声明或者将主函数放到被调用函数之后

  

把函数定义显式申明下就是了

楼主的主要错误是函数未声明。这个代码我又祭出我原来的一句话代码如下（经过验证）：
#include<stdio.h>
int main()
{
    int day;
    int day_of_year(int,int,int);
    printf("%d\n",day_of_year(2012,5,12));
    return 0;
}
int day_of_year(int year,int month,int day)
{
    int m,y=year;
    for(m=1;m<month;m++)day+=30+(m<8)*m%2+(m>7)*(!(m%2))-(m==2)*(2-((!(y%4)&&(y%100))||!(y%400)));
    return day;
}