i am designing a code that will calculate tomorrows date but there is some problem with the code,
when i enter
year = 2008 or anyother
month =12
day = 31
it gives tmorrows date as 1/2/2008
please help and tell me if i can do more improvements thanks

#include<conio.h>
#include<stdio.h>
main(void)
{
 int t;
 int y,d=1,i,m=1;
 printf("Enter the Year: ");
 scanf("%4u",&y);
 if(y<0)
 y=-y;
 printf("Enter the Month: ");
 scanf("%2u",&m);
 if(m<=0 || m>=12)
 m=1;
 i=y%4;
 printf("Enter the Day: ");
 scanf("%2u",&d);
 if (d>=1&&d<28)
 d=d+1;
 else if(d==i&&m==2)
 {d=1;
 m=3;}
 else if (d==30&&m==4||m==6||m==9||m==11)
 {d=1;
 m=m+1;}
 else if (d==31&&m==1||m==2||m==3||m==5||m==7||m==8||m==10)
{
 d=1;
 m=m+1;
 }
 else if(d==31&&m==12)
 { 
 d=1;
 m=1;
 y=y+1;
 }
 printf("Tomorrow's Date is\n  %d/%d/%d ",d,m,y);
 getch();
}

You are kicking off December! :P
Check if(m<=0 || m>=12) .
It should be if(m<=0 || m>12) .

Also check your leap years handling.

Can you use the functions in time.h? If you can, then just fill in a struct tm and call mktime() to calculate tomarrow

#include <time.h>
...
int main()
{
    int m = 11; // November
    int y = 2008;
    int d = 2;

   struct tm tm;
   // clear all members of the structure
   memset(&tm,0,sizeof(struct tm));

   tm.tm_year = y-1900;
   tm.tm_mon = m-1;
   tm.tm_day = d;
   // increment tomarrow
   tm.tm_mday++;
   mktime(&tm);

Not to mention, the unindented code which is simply awful to look at.

Second that. Also, flow of the code is confusing which is really awful considering the simplicity of the problem.

main returns an integer. So it's int main() not just main(void) .

This test condition is wrong:

else if(d==i&&m==2)

You aren't checking for leap years, although at one point you do find i=y%4; . Comparing this value with the number of days screws up the whole thing.

This article has been dead for over six months. Start a new discussion instead.