日历问题
日历，输入年份和月份，输出该月日历
程序代码：
#include <stdio.h>
#include <stdbool.h>
//Define Global Variables
int year,month,numberDays,weekFirstDay,lastDay;
int daysPerMonth[12]={ 31,28,31,30,31,30,31,31,30,31,30,31 };
bool leapFlag;
//Declare some Functions in the Program.
void space (void);
void dispcal (void);
bool leapYear (void);
int numbersOfMonth (void);
int weekOfFirstday (void);
int sumDay (int n);
//Main Program Start...
int main (void) {
printf ("please date[year month]:");
scanf ("%i%i",&year,&month);
printf ("\n");
//Call Functions.
//weekOfFirstday():Get week of Current Month First day.
//numbersOfMonth():Get numbers of Current Month.
//dispcal(weekFirstDay):display Cureent month calendar.
weekOfFirstday();
numbersOfMonth();
dispcal();
//Return OS.
return 0;
}
//
int weekOfFirstday (void) {
switch (month) {
case 1: numberDays=1;break;
case 2:numberDays=sumDay(2);break;
case 3:numberDays=sumDay(3);break;
case 4:numberDays=sumDay(4);break;
case 5:numberDays=sumDay(5);break;
case 6:numberDays=sumDay(6);break;
case 7:numberDays=sumDay(7);break;
case 8:numberDays=sumDay(8);break;
case 9:numberDays=sumDay(9);break;
case 10:numberDays=sumDay(10);break;
case 11:numberDays=sumDay(11);break;
case 12:numberDays=sumDay(12);break;
}
if(leapYear()==true&&month>2) {
numberDays+=1;
}
weekFirstDay=((year-1)*365+(year-1)/4-(year-1)/100+(year-1)/400+numberDays)%7;
return weekFirstDay;
}
//
int sumDay (int n) {
int i,sum=1;
for(i=0;i<(n-1);i++) {
sum += daysPerMonth[i];
}
return sum;
}
void space (void) {
int i;
for(i=0;i<weekFirstDay;i++) {
printf ("\t");
}
}
//
void dispcal (void) {
int index,col,firstDay=1;
printf ("---------------------------------------------------\n");
printf ("Sun\tMon\tTue\tWed\tThu\tFri\tSat\n\n");
space();
for(col=1;col<=7-weekFirstDay;col++,firstDay++) {
printf ("%i\t",firstDay);
}
printf ("\n\n");
for(index=1,col=firstDay;col<=lastDay;col++,index++) {
printf ("%i\t",col);
if(index%7==0) {
printf ("\n\n");
}
}
printf ("\n--------------------------------------------------\n");
}
//
bool leapYear (void) {
if(((year%4==0&&year%100!=0)||year%400==0)&&month==2) {
leapFlag=true;
}else{
leapFlag=false;
}
return leapFlag;
}
//
int numbersOfMonth (void) {
if(leapYear()==true) {
lastDay=daysPerMonth[month-1]+1;
}else{
lastDay=daysPerMonth[month-1];
}
return lastDay;
}
程序代码：root@~/prog #./cale
please date[year month]:2011 7
---------------------------------------------------
Sun Mon Tue Wed Thu Fri Sat
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
--------------------------------------------------
root@~/prog #
