Thread: a problem

hi i'm a newbie to c and am trying to create a program that calculates the "greatest common divisor". i'm always getting 0 as the result. here's my src:

Code:

 #include <stdio.h>

main() {
   int m, n, i;
   
   printf("Enter two integers: ");
   scanf("%d%d", &m, &n);
   do {
      i = m / n;
      n = m % n;
      m = i;
   } while ( n != 0 ) ;
   printf("Greatest common diviser: %d", m);
   return 0;
}

i would be grateful if someone can help me. btw i'm using Devcpp.

thanks alot yes there was a problem in my formula. this is my new src:

Code:

 #include <stdio.h>

main() {
   int m, n, i;
   
   printf("Enter two integers: ");
   scanf("%d%d", &m, &n);
   do {
      i = n;
      n = m % n;
      m = i;
   } while ( n != 0 ) ;
   printf("Greatest common diviser: %d", m);
   return 0;
}

thanks alot guys. i don't know i'v been working on it for an hour yesterday and couln't get it, today i fixed it within 15 min. anyways i'm also trying to make a program that ask the user to enter a number, then reverse it's digits. i know how to do it with a limited number of digits, but how can i do it with an almost unlimited(as the int type doesn't support all numbers) number of digits.
thanks again.

i didn't learn about strings yet all i know is the basics(ex. loops, if statement).

it is good practice to specify the int before the main, even thought is dosn't matter as the compiler would assume it as an int. So change it to

Code:

int main()
{
   ...
   ...
   return 0;
}

to follow the good programming practice

ssharish2005

what's the difference between "main()" and "int main"?

int main() is right ... or int main( void ) is right http://faq.cprogramming.com/cgi-bin/...&id=1043284376

thanks guys i'm sorry but i'm having some trouble. i'm trying to write a program that prints a one-month calendar, the user specifies the number of days in the month and the day of wich the month begins. here's my src:

Code:

#include <stdio.h>
main() {
   int i, n, j;
   
   printf("Enter number of days in month: ");
   scanf("%d", &n);
   printf("Enter starting day of the week (1=Sun, 7=Sat): ");
   scanf("%d", &j);
   for (i = 1; i <= n; i++) {
      printf("j = %d", j);
      j++;
      if (j > 7) {
         printf("\n");
         j = 1;
      }
   }
   return 0;
}

i'm sorry i have two probs:1) i don't know how to make the the month begin on a specific day(ex. the month begins on thursday). 2) i don't know how to make the program start a new line. i think this problem is because of the first prob.
thanks