C语言打印万年历

布满荆棘的人生 2022-09-17 08:30 249阅读 0赞

Date.h文件如下：

//打印万年历从1900年起
    #ifndef DATE_H
    #define DATE_H
    #include <string.h>
    #define OUT_OF_YEAR -1
    //是否是闰年
    bool isLeap(int year){
    	if(year<1900) return OUT_OF_YEAR;
    	return (year%4==0)&&(year%100!=0)||(year%400==0);
    }
    //从year到1900年间闰年个数
    int  LeapYearNum(int year){
    	if(year<1900) return OUT_OF_YEAR;
    	int LeapYear=0;
    	for (int i=1900;i<=year;i++)
    	{
    		if(isLeap(i)){
    			++LeapYear;
    		}	
    	}
    	return LeapYear;
    }
    //到year开始到1900年的天数
    int GetDayNum(int year){
    	if(year<1900) return OUT_OF_YEAR;
    	return LeapYearNum(year)+(year-1900)*365;
    }
    //year年,mounth月的天数
    int GetDayOfMouth(int year,int mounth){
    	if (year<1900 || mounth<1||mounth>12) return OUT_OF_YEAR;
    	int dayNum=0;
    	switch (mounth)
    	{
    	case 1:
    	case 3:
    	case 5:
    	case 7:
    	case 8:
    	case 10:
    	case 12:
    		dayNum=31;
    		break;
    	case 4:
    	case 6:
    	case 9:
    	case 11:
    		dayNum=30;
    		break;
    	case 2:
    		if(isLeap(year)){
    			dayNum=29;
    		}else{
    			dayNum=28;
    		}
    		break;
    	default:
    		dayNum=0;
    	}
    	return dayNum;
    }
    //到1900年的天数
    int getDay(int year,int mouth){
    	int mouthDay=0;
    	for (int i=1;i<mouth;i++)
    	{
    		mouthDay+=GetDayOfMouth(year,i);
    	}
    	return GetDayNum(year)+mouthDay;
    }
    int getWeek(int year,int mouth){
    	return getDay(year,mouth)%7+1;
    }
    //得到星期英文缩写
    char* getWeekChar(int i){
    	if (i<1||i>7) return "";
    	char *WeekChar="   ";
    	switch(i){
    	case 1:
    		WeekChar="Mon";
    		break;
    	case 2:
    		WeekChar="Tue";
    		break;
    	case 3:
    		WeekChar="Wed";
    		break;
    	case 4:
    		WeekChar="Thu";
    		break;
    	case 5:
    		WeekChar="Fri";
    		break;
    	case 6:
    		WeekChar="Sat";
    		break;
    	case 7:
    		WeekChar="Sun";
    		break;
    	default:
    		WeekChar="";
    	}
    	return WeekChar;
    
    }
    //打印月份
    void printMouth(int year,int mouth){
    	int startWeek=getWeek(year,mouth);
    	int days=GetDayOfMouth(year,mouth);
    	printf("*********************%d年%d月******************************\n",year,mouth);
    	int dayIndex=1;
    	printf("\n");
    	for (int i=1;i<=7;i++)
    	{
    		printf(" %s\t",getWeekChar(i));
    	}
    	printf("\n");
    	for (int i=1;i<=50;i++)
    	{
    		if (dayIndex>days) break;
    		if (i<startWeek)
    		{
    			printf("   \t");
    		}else{
    			printf("%4d\t",dayIndex);
    			dayIndex++;
    		}
    		if (i%7==0) printf("\n");
    	}
    	printf("\n");
    }
    #endif

调用方式如下：

#include <stdio.h>
    #include "Date.h"
    int main( void )
    {	
    
    	printMouth(2013,10);
    	
    }

运行结果如下：

*********************2013年10月******************************
    
     Mon     Tue     Wed     Thu     Fri     Sat     Sun
               1       2       3       4       5       6
       7       8       9      10      11      12      13
      14      15      16      17      18      19      20
      21      22      23      24      25      26      27
      28      29      30      31
    请按任意键继续. . .