Calendar Program In C

#include

int day(int m1,int y1)
{
int d;
if(m1==1 || m1==3 || m1==5 || m1==7 || m1==8 || m1==10 || m1==12)
d=31;
else if(m1==4 || m1==6 || m1==9 || m1==11)
d=30;
else if((y1%100!=0 && y1%4==0) || y1%400==0)
d=29;
else
d=28;
return d;
}

void main()
{
long unsigned int t;
unsigned int y,y1,m,m1,d,da,i,j,k;
char
a[12][20]={"January","February","March","April","May","June","July","Augus
t","September","October","November","December"};
clrscr();
textcolor(CYAN);
cprintf("Enter the year: ");
scanf("%4u",&y);
if(y<0)
y=-y;
cprintf("Enter the month: ");
scanf("%2u",&m);
if(m<=0 || m>=13)
m=1;
clrscr();
gotoxy(32,2);
cprintf("Calendar");
y1=0;
t=0;
while(y1 {
if((y1%100!=0 && y1%4==0) || y1%400==0)
t=t+366;
else
t=t+365;
y1++;
}
m1=1;
while(m1 {
d=day(m1,y);
t=t+d;
m1++;
}
d=t%7;
printf("Year: '%u'",y);
printf("Month: '%s'",a[m-1]);

printf("%6s%6s%6s%6s%6s%6s%6s","Sun","Mon","Tue","Wed","Thu","Fri","Sat");
textcolor(GREEN);
k=1;
for(i=1;i<=day(m,y);i++,k++)
{
if(i==1)
{
if(d==0)
{
for(j=1;j<7;j++,k++)
printf("%6s","");
}
else
{
for(j=1;j printf("%6s","");
}
}
cprintf("%6d",i);
if(k%7==0)
printf("");
}
gotoxy(27,22);
cprintf("www");

getch();
}

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