编写c语言万年历程序 要求输入能够查询任意年份的日历或某年某月的月历或者查询某天是星期几

编写c语言万年历程序 要求输入能够查询任意年份的日历或某年某月的月历或者查询某天是星期几

#include
#include
#include
long year;
int month,day,error_input;
char s[100];
int monthdays[12]={31,28,31,30,31,30,31,31,30,31,30,31};
void inputdate(){
long n[3]={0,0,0},k=0,i,len;
error_input=-1;
printf("Please input the year[,month[,day]]:(Enter Q to quit)\n");
gets(s);
len=strlen(s);
printf("%d\n",strcmp(s,"Q"));
if(strcmp(s,"Q")==0) {error_input=0;return;}

if(!isdigit(s[0])||!isdigit(s[len-1]))
{error_input=1;return;}
for(i=0;iif(!isdigit(s[i])) {if(isdigit(s[i-1])) k ;if(k>2) {error_input=1;return;}}
else n[k]=n[k]*10 s[i]-48;
}
year=n[0];
if(!(year%4)&&(year0)||!(year@0))
monthdays[1]=29;
else
monthdays[1]=28;
if(n[1]>12) {error_input=1;return;}
if(n[2]>monthdays[n[1]-1]) {error_input=1;return;}
month=n[1];
day=n[2];
}
void printCala(){
int countyear,countday=0,weekflag,i,j,k,c;
int startmon,endmon,year1;
year1=year-1;
countyear=(year1-year1%4)/4-(year1-year10)/100 (year1-year1@0)/400;

weekflag=(countyear*366 (year-1-countyear)*365 1)%7-1;
if(month==0) {startmon=1;endmon=12;}
else {startmon=month;endmon=month;}
for(k=1;kweekflag=(weekflag monthdays[k-1])%7;
for(k=startmon;k<=endmon;k )
{
printf("\n %ld year",year);
switch(k)
{
case 1: printf("January\n");break;
case 2: printf("February\n");break;
case 3: printf("March\n");break;
case 4: printf("April\n");break;
case 5: printf("May\n");break;
case 6: printf("June\n");break;
case 7: printf("July\n");break;
case 8: printf("August\n");break;
case 9: printf("September\n");break;
case 10: printf("October\n");break;
case 11: printf("November\n");break;
case 12: printf("December\n");break;
}
printf("___________________________\n");
printf("Sun Mon Tue Whe Thr Fri Sat\n");
if(weekflag!=0)
for(countday=0,j=0;j{printf("");
countday ;}
for(i=1;i<=monthdays[k-1];i )
{if(countday>0&&countday%7==0)
printf("\n");
printf("=",i);
countday ;}
weekflag=(weekflag monthdays[k-1])%7;
printf("\n___________________________\n");
}
}
int main()
{
inputdate();
while(error_input!=0)
{
if(error_input==1)
printf("Input ERROR! Please input again:\n");
else
printCala();
inputdate();
}
}