编写程序，要求根据用户输入的年月，打印出该月份的日历

野性酷女 2021-11-09 05:14 294阅读 0赞

[日期差值 问题 or 本页代码方法改进（日期差值 法二）][_ or _]  
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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNDgwNjA3_size_16_color_FFFFFF_t_70 1]  
完整代码：

#include<stdio.h>
    #include<stdlib.h>
    #include<string.h>
    int IsInYear(int year);                               //判断是否为闰年 是闰年返回0 否则返回1 
    int daysInMonth(int year,int month);                  //计算一个月有多少天 
    int Yearweekday(int year);                            //每年第一天星期几  星期天用1表示 依次类推
    int mouthweekday(int year,int month);                 //每月第一天星期几  星期天用1表示 依次类推
    void printdate(int mouthweekday,int daysInMonth);     //打印
    int main()
    {
     int year,mouth;
     printf("请输入想要显示的年份和月份："); 
     while(scanf("%d%d",&year,&mouth))
     {
        printdate(mouthweekday(year,mouth),daysInMonth(year,mouth));
     printf("请输入想要显示的年份和月份："); 
     }
     return 0;
    } 
    
    int IsInYear(int year)
    {
     return ((year%4)&&(!(year%100))||(year%400));
    }
    int daysInMonth(int year,int month)
    {
     switch(month)
     {
      case 1:
      case 3:
      case 5:
      case 7:
      case 8:
      case 10:
      case 12: return 31;
      
      case 4:
      case 6:
      case 9:
      case 11: return 30;
      
      case 2:  return (29-IsInYear(year));  
      default: return 0;
     }
     } 
    int Yearweekday(int year)
    {
     //计算 公元[1年，year) 之间共有多少天 
     int sum=0;
     for(int i=1;i<year;i++)
      sum=sum+(366-IsInYear(i));
     //计算所输年份第一天【1.1】是星期几 
     //星期天用1表示 依次类推
     int weekday=(sum+1)%7+1;
     return weekday;
    }
    
     int mouthweekday(int year,int month)
    {
     int mouthweekday=Yearweekday(year);
      for(int i=0;i<month;i++)mouthweekday=(mouthweekday+daysInMonth(year,i))%7;
      return mouthweekday;
     } 
    void printdate(int mouthweekday,int daysInMonth)
    {
     printf("日 一 二 三 四 五 六 \n");
     for(int i=0;i<mouthweekday;i++)
     {
     printf("   ");
     }
     for(int j=1;j<=daysInMonth;j++)
     {
      if(j<10){ if((j+mouthweekday)%7==0)
       printf(" %d \n",j);
      else  
       printf(" %d ",j);}
      else{
        if((j+mouthweekday)%7==0)
       printf("%d\n",j);
      else  
       printf("%d ",j);
      }
     }
     printf("\n");
    }

[_ or _]: https://blog.csdn.net/qq_21480607/article/details/106627232
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