for(i=1;i<=startday;i++)

{

printf("\t");//把每月1日之前的空格打出来

}

for(i=1;i<=monthdays;i++)

{

printf("%d\t",i);

if(i==7*k-startday)

{

printf("\n");

k++;

}

}

}

printf("\n\n");

}

void nianli()

{

int i,j,k,startday,monthdays,month,year;

system("cls");

printf("=======================================================\n输入年份：");

scanf("%d",&year);

for(month=1;month<=12;month++)

{

k=1;

monthdays=monthday(month,year);

startday=firstday(month,year);

printf("\t\t\t%d月\n",month);

printf(" Sun\tMon\tTue\tWed\tThu\tFri\tSat\n");

if(startday==7)

{

for(i=1;i<=monthdays;i++)

{

printf("%d\t",i);

if(i%7==0)

{

printf("\n");

}

}

}

if(startday!=7)

{

for(j=1;j<=startday;j++)