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/* Note:Your choice is C IDE */
#include "stdio.h"   
/*自定义函数说明*/  
void screen();                /*系统主界面*/  
void whatisit();              /*查询某年某月某日是星期几*/  
void leapyear();              /*查询某年是否是闰年*/  
void printyearday();          /*打印某年的全年日历*/  
int IsLeapYear(int year);         /*判断某年是否为闰年*/  
int whatisita(int,int);      /*计算当天是星期几*/  
int everymonth(int,int);     /*查询某月最大天数*/  
void printmonth(int,int);     /*打印某年某月月历*/  
void printmonthday();           /*打印某年的某月最大天数*/  
/***************************************************************/  
/*定义指针数组*/  
char *week[]={"Sunday","Monday","Tuesday","Wednesday",   
             "Thursday","Friday","Saturday"};   
/***************************************************************/  
/*主函数*/  
void main()   
{   
  screen();         
}   
/***************************************************************/  
/*万年历查询主界面（含部分功能）*/  
void screen()   
{   
    int n;   
    while(1)   
    {   printf("ID:2013914122");   
        printf("万年历查询程序:\n");   
        printf("1.查询某年某月某日是星期几\n");   
        printf("2.查询某年是否是闰年   ");   
        printf("3.打印某年的全年日历   ");   
        printf("4.查询某月最大天数   ");   
        printf("5.退出   ");   
        printf("请输入要查询的选项:");   
        scanf("%d",&n);   
        switch(n)   
        {   
            case 1:whatisit();break;   
            case 2:leapyear();break;   
            case 3:printyearday();break;   
            case 4:printmonthday();break;   
            case 5:return;   
            default:printf("你输入错误，请按要求输入!!!\n");break; 
        }   
    }   
}   
/***************************************************************/  
/*查询某年某月某日是星期几*/  
void whatisit()   
{   
    int y,m,d,s,k=1,sum,n,i;   
    char yn;   
    int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};   
    while (k)   
    {   
        printf("请依次输入年,月,日:\n");   
        scanf("%d,%d,%d",&y,&m,&d);   
        s=0;   
        for(i=1;i<m;i++)   
            s=s+a[i];   
        s=s+d;   
        if(IsLeapYear(y) && m >2)    
          s=s+1;   
        sum=s;   
        n=(y-1+(y-1)/4-(y-1)/100+(y-1)/400+sum)&7;   
        printf("这天是%s\n",week[n]);   
        printf("是否继续查询(Y/N)?");   
        scanf("%c",&yn);getchar();   
        if(yn=='y'||yn=='y')   
           k=1;   
        else k=0;
    }   
}   
/***************************************************************/  
/*判断某年是否是闰年*/  
int IsLeapYear(int year)   
{   
       
    return (((year%4)==0 && (year%100)!=0) || ((year%400)==0));   
  
}   
/***************************************************************/  
/*查询某年是否是闰年*/  
void leapyear()   
{   
    int y,k=1;char yn;   
    while(k)   
    {   
        printf("请输入要查询的年份:\n");   
        scanf("%d",&y);   
        if(IsLeapYear(y))   
            printf("是闰年!\n");   
        else  
        printf("不是闰年!\n");   
        printf("是否继续查询(Y/N)?");   
        scanf("%c",&yn);   
        getchar();   
        if(yn=='y'||yn=='y')   
            k=1;   
        else k=0;  
    }   
}   
/***************************************************************/  
/*计算当天是星期几*/  
int whatisita(int y,int m)   
{   
    int n,i,sum;   
    int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31},s=0;   
    for(i=1;i<m;i++)   
        s=s+a[i];   
    if(IsLeapYear(y) && m>2)   
        s=s+i;   
        n=(y-1+(y-1)/4-(y-1)/100+(y-1)/400+sum)&7;   
    return n;  
}   
/***************************************************************/  
/*打印某年的全年日历*/  
void printyearday()   
{   
    int y,value,sum,i,k=1;   
    char yn;   
    while(k)   
    {   
        printf("请输入查询日历的年份\n:");   
        scanf("%d",&y);   
        for(i=1;i<=12;i++)   
        {   
            printf("%d年%d月的信息:\n",y,i);   
            value=whatisita(y,i);   
            sum=everymonth(y,i);   
            printmonth(value,sum);   
            printf("\n");   
        }   
        printf("是否继续查询(Y/N)?");   
        scanf("%c",&yn);   
        getchar();   
        if(yn=='y'||yn=='y')   
            k=1;   
        else k=0; 
    }   
}   
/***************************************************************/  
/*查询某月最大天数*/  
int everymonth(int year,int month)   
{   
    int s,i;   
    static int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};   
    s=a[month];   
    if(IsLeapYear(year)&&month==2)   
        s=s+i;   
    return s;   
}   
/***************************************************************/  
/*打印某年的某月最大天数函数*/  
void printmonthday()   
{   
    int y,m,value,k=1;char yn;   
    while(k)   
    {   
        printf("请输入查询的年份,月份\n:");   
        scanf("%d,%d",&y,&m);   
        value=everymonth(y,m);   
        printf("%d年%d月的最大天数为%d:\n",y,m,value);   
        printf("%c",&yn);getchar();   
        if(yn=='y'||yn=='y')   
            k=1;   
        else k=0; 
    }   
}   
/*打印月历*/  
void printmonth(int value,int sum)   
{   
    int n,i=0,j;   
    char*x[7]={"Sunday","Monday","Tuesday","Wenesday","Tursday",   
               "Friday","Saturday"};   
    for(j=0;j<7;j++)   
    {   
        printf("%s",x[j]);   
    }   
    printf("\n");   
    while(i<value)   
    {   
        printf(" ");   
        i++;   
    }   
    for(n=1;n<=7-value;n++)   
    printf("    %d",n);   
    while(n<=sum)   
    {   
        if((n+value-1)%7==0)   
        printf("\n");   
        if(n/10>0)   
        printf("    %d",n);   
        else  
        printf("    %d",n);   
        n++;  
    }
    printf("ID: 2013304105\n");    
}  

总结：这个程序内容比较多，而且很容易出错，很考验人的眼力以及脑力。从这次作业中，我得到教训：做C语言必须要细心，因为一步错，步步错！