用c写的简单的日历（学习模块划分）

简单日历

​ 主要目的是学习函数模块划分，成品大概是这样，加了一些花里胡哨的东西(/▽＼)

​

分三个模块，主函数.c 显示.c 计算.c 与.h 文件

有两种实现方式，区别在于是否以数组在模块之间传递。

第一种-用数组进行保存日历页

1.主函数.c

输入信息并控制

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include "calendar1.h"
#include <stdbool.h>
#include <string.h>
#define ON 1
#define OFF 0

int main( )
{
	int year = 2019;
	int month = 7;
	char op[10] = { 0 };
	int button = 1;
	do
	{
		calen_cal(year,month);
		calen_display(year, month,button);
		scanf(" %s", op);
		if( !strcmp(op, "ON") ) {
			button = 1; continue;
		}
		if( !strcmp(op, "OFF") ) {
			button = 0; continue;
		}
		if( *op == 'U' || *op == 'u' )
		{
			if( month == 1 )
			{
				--year;
				month = 12;
			}
			else --month;
			continue;
		}
		if( *op == 'D' || *op == 'd' )
		{
			if( month == 12 )
			{
				++year;
				month = 1;
			}
			else ++month;
			continue;
		}
		if( *op == 'R' || *op == 'r' )break;
        
		printf("请按以下格式输入：2019-7
");
		int temY, temM;
		scanf("%d-%d", &temY, &temM);
		if( is_right(temY, temM) )
		{
		    year = temY; month = temM;
		}
	} while( true );
}

2.计算函数相关.c

计算( •̀ ω •́ )✧

​```c
#include <stdio.h>

#include "calendar.h"
int months[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };

int is_leepyear(int year)//是否为闰年
{
	return  ( year % 4 == 0 && year % 100 != 0 || year % 400 == 0 );
}
int is_right(int year, int mon) //输入的年份或月份是否正确
{
	return ( year > 1900 && mon <= 12 && mon >= 1 );
}
int first_day_index(int year, int mon)//返回该月第一天的下标  0-6
{
	if( is_leepyear(year) )months[1] = 29;
	else months[1] = 28;

	int days = 0;
	for( int i = mon - 1; i > 0; --i )
	{
		days += months[i - 1];
	}
	for( int i = year - 1; i >= 1900; --i )
	{
		if( i % 4 == 0 && i % 100 != 0 || i % 400 == 0 )		days += 366;
		else days += 365;
	}
	return days % 7;
}

int Last_days(int year, int mon)// 返回上个月最后一天的天数，用来排日历中的上一月信息
{
	if( mon == 1 )return 31;
	else  return months[mon - 2];
}

void calen_cal(int *calen,int year,int mon,int index)//将排好的信息放到数组中
{
	int Last_day = Last_days(year, mon);
	int count = 0;
	//排上个月
	for( int i = 1; i <= index; ++i, ++count )
	{
		calen[count]=Last_day - index + i;
	}
	//排本月
	for( int i = 1; i <= months[mon - 1]; ++i, ++count )
	{
		calen[count] =  i;
	}
	//排下月
	for( int i = 1; count < 42; ++i, ++count )
	{
		calen[count] = i;
	}
}

​```

3. 打印显示.c

花里胡哨的显示

​```c
#include <stdio.h>
#include <Windows.h>
#include "calendar.h"
void calen_print(int *calen, int button, int index)
{
	//打印上一月
	int i = 0;
	for( i = 1; i <= index; ++i )
	{
		if( button == 1 )printf("%5d", calen[i - 1]);
		else printf("     ");
		if( i % 7 == 0 )putchar(10);
	}
	//打印本月
	for( ; calen[i - 1] != 1; ++i )
	{
		printf("%5d", calen[i - 1]);
		if( i % 7 == 0 )putchar(10);
	}
	//打印下一月
	for( ; i <= 42; ++i )
	{
		if( button == 1 )printf("%5d", calen[i - 1]);
		else printf("     ");
		if( i % 7 == 0 )putchar(10);
	}
}
void calen_ui(int *calen, int button, int index,int year,int mon)
{
	system("cls");
	//这块是更改控制台颜色
	srand(time(NULL));
	int rand_color;
	HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
	//

	rand_color = rand( ) % 14;
	SetConsoleTextAttribute(hConsole, rand_color);
	printf("%d-%d		          U/D
", year, mon);

	rand_color = rand( ) % 14;
	SetConsoleTextAttribute(hConsole, rand_color);
	printf("Mon  Tue  Wed  Thu  Fri  Sat  Sun
");

	rand_color = rand( ) % 14;
	SetConsoleTextAttribute(hConsole, rand_color);
	printf("--------------------------------------
");

	rand_color = rand( ) % 14;
	SetConsoleTextAttribute(hConsole, rand_color);
	calen_print(calen, button,index);

	rand_color = rand( ) % 14;
	SetConsoleTextAttribute(hConsole, rand_color);
	printf("--------------------------------------
");

	rand_color = rand( ) % 14;
	SetConsoleTextAttribute(hConsole, rand_color);
	printf("U/u 向上翻页，D/d向下翻页，R/r退出，ON/OFF是否显示其他天数，输入其他进入日期跳转模式
");
	
	rand_color = rand( ) % 14;
	SetConsoleTextAttribute(hConsole, rand_color);

}

​```

4. 头文件.h

头文件声明

​```c
void calen_ui(int *calen, int button, int index, int year, int mon);
void calen_cal(int *calen, int year, int mon,int index);
int first_day_index(year, mon);
​```