利用吉姆拉尔森公式，详见初等数论，注意控制格式。

看不懂c++的童鞋，把所有cin理解为scanf，把cout理解为printf，这个程序是小时候写的，所有不想改了。

#include "iostream"

using namespace std;

int main()

{

int m,d,monthmax,y;

while(1)

{

cout<

cin>>y;

cout<

cin>>m;

cout<

//判断年份和月份

if(y%4==0||(y%100==0&&y%400==0))//闰年

{

if(m==1||m==3||m==5||m==7||m==8||m==10||m==12)

monthmax=31;

if(m==2)

monthmax=29;

if(m==4||m==6||m==9||m==11)

monthmax=30;

}

if(y%4!=0)//平年

{

if(m==1||m==3||m==5||m==7||m==8||m==10||m==12)

monthmax=31;

if(m==2)

monthmax=28;

if(m==4||m==6||m==9||m==11)

monthmax=30;

}

//基姆拉尔森计算公式取得一号周几

if(m==1||m==2)

{

m+=12; //一月算做上一年的十三月，二月算做上一年的十四月

y--;

}

d=(2+2*m+3*(m+1)/5+y+y/4-y/100+y/400)%7;//算出这月一号周几

if(d==0)

{

d=7;

}

//输出日历

{

{

//标题模块

if(m==13)

{

cout<

}

if(m==14)

{

cout<

}

if(m!=13&&m!=14)

{

cout<

}

}

cout<

for(int i=1; i<=d-1; i++)

{

cout<

}

for(int j=1; j<=monthmax; j++)

{

if(j<10)

{

cout<

}

if(j>=10)

{

cout<

}

if((j+d-1)%7==0)

{

cout<

}

if(j==monthmax)

{

cout<

}

}

cout<

}

}

}

the results:

另一版本：

#include

#include

#define SIGN_WEEK 6

#define SIGN_YEAR 2000

using namespace std;

void calendar(int week,int year)

{

int month_day[14]= {31,31,0,31,30,31,30,31,31,30,31,30,31,31};

char month_name[12][10]= {"January","February","March","Apirl","May","June","July","August","September","October","November","December"};

int i,j,n,m,num0=0,num1=31,nweek0=week,nweek1;

if(year%4==0)

{

if(year%100!=0) month_day[2]=29;

else

{

if(year%400==0) month_day[2]=29;

else month_day[2]=28;

}

}

else month_day[2]=28;

printf("The calendar of the year %d\n\n",year);

for(m=0; m!=12; m+=2)

{

if(m-1<0)

{

nweek0=week;

nweek1=(week+num1%7)>7?(week+num1%7)-7:(week+num1%7);

}

else

{

num0=num0+month_day[m-1]+month_day[m];

nweek0=(week+num0%7)>7?(week+num0%7)-7:(week+num0%7);

num1=num1+month_day[m]+month_day[m+1];

nweek1=(week+num1%7)>7?(week+num1%7)-7:(week+num1%7);

}

printf("%-10s %2d               %-10s %2d\n=========================== ===========================\nSun Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat\n",month_name[m],m+1,month_name[m+1],m+2);

for(i=nweek0,j=nweek1,n=0; j!=nweek1-6*7; j--)

{

if(n<7)

{

if(i>0) printf("%3d ",month_day[m]-i+1);

else if(i<=0)

{

if(i>-month_day[m+1]) printf("%3d ",-i+1);

else printf("%3d ",-i-month_day[m+1]+1);

}

i--;

j+=1;

n++;

}

else

{

if(j>0) printf("%3d ",month_day[m+1]-j+1);

else if(j<=0)

{

if(j>-month_day[m+2]) printf("%3d ",-j+1);

else printf("%3d ",-j-month_day[m+2]+1);

}

n++;

}

if(n==14)

{

printf("\n");

n=0;

}

}

printf("=========================== ===========================\n\n");

}

}

void startWeek(int year)

{

int start_week,days;

if(year>SIGN_YEAR)

{

days=(year-SIGN_YEAR)*365+(year-SIGN_YEAR)/4-(year-SIGN_YEAR)/100+(year-SIGN_YEAR)/400+(((year-SIGN_YEAR)%4)+3)/4+((year-SIGN_YEAR)%400==0?0:((year-SIGN_YEAR)%100==0?1:0));

start_week=(SIGN_WEEK+days%7)>7?(SIGN_WEEK+days%7)-7:(SIGN_WEEK+days%7);

}

else

{

days=(SIGN_YEAR-year)*365+(SIGN_YEAR-year)/4-(SIGN_YEAR-year)/100+(SIGN_YEAR-year)/400;

start_week=(SIGN_WEEK-days%7)>0?(SIGN_WEEK-days%7):(SIGN_WEEK-days%7+7);

}

calendar(start_week,year);

}

int main()

{

int year;

printf("Enter year:");

scanf("%d",&year);

startWeek(year);

return 0;

}

the result:

再一个版本：

#include

long int f(int year,int month)

{

if(month<3) return year-1;

else return year;

}

long int g(int month)

{

if(month<3) return month+13;

else return month+1;

}

long int n(int year,int month,int day)

{

return 1461L*f(year,month)/4+153L*g(month)/5+day;

}

int w(int year,int month,int day)

{

return(int) ((n(year,month,day)%7-621049L%7+7)%7);

}

int date[12][6][7];

int day_tbl[ ][12]= {{31,28,31,30,31,30,31,31,30,31,30,31},{31,29,31,30,31,30,31,31,30,31,30,31}};

int main()

{

int sw,leap,i,j,k,wd,day;

int year;

char title[]="SUM MON TUE WED THU FRI SAT";

printf("Please input the year whose calendar you want to know:\n");

scanf("%d%*c",&year);

sw=w(year,1,1);

leap=year%4==0&&year%100||year%400==0;

for(i=0; i<12; i++)

for(j=0; j<6; j++)

for(k=0; k<7; k++)

date[i][j][k]=0;

for(i=0; i<12; i++)

for(wd=0,day=1; day<=day_tbl[leap][i]; day++)

{

date[i][wd][sw]=day;

sw=++sw%7;

if(sw==0) wd++;

}

printf("\n|================== The Calendar of Year %d==================|\n|",year);

for(i=0; i<6; i++)

{

for(wd=0,k=0; k<7; k++)

wd+=date[i][5][k]+date[i+6][5][k];

wd=wd?6:5;

printf(" %2d %s %2d %s|\n|",i+1,title,i+7,title);

for(j=0; j

{

printf(" ");

for(k=0; k<7; k++)

if(date[i][j][k])

printf("%4d",date[i][j][k]);

else printf(" ");

printf(" ");

for(k=0; k<7; k++)

if(date[i+6][j][k])

printf("%4d",date[i+6][j][k]);

else printf(" ");

printf("|\n|");

}

}

puts("==============================================================|");

}

the results: