Thread: Some kind of memory mistake. Please review

The following code runs fine for denom <= 11, but it gives a segmentation fault with the gcc compiler and doesn't run at all with other compilers for denom > 11. Please help! Thanks.

Code:

#include <stdio.h>


void arrage(long *a, long *b);
void reduce(long *numer, long *denom, long gcd);
int getGCD(long a, long b);
int getLCD(long a, long b);

main()
{
  long denom, lcd, sumNumer = 1, sumDenom = 1;

  for(denom = 2; denom <= 11; denom++) {
    lcd = getLCD(sumDenom, denom);
    sumNumer = sumNumer * lcd / sumDenom + lcd / denom;
    sumDenom = lcd;
    reduce(&sumNumer, &sumDenom, getGCD(sumDenom, sumNumer));
  }
  printf("Sum is: %d/%d or %.5f in decimal form.\n", 
	 sumNumer, sumDenom, (double)sumNumer / sumDenom);
  getchar();
}

void arrage(long *a, long *b)
{
  int temp;
  if(*b > *a) {
    temp = *a;
    *a = *b;
    *b = temp;
  }    
}

void reduce(long *numer, long *denom, long gcd)
{
  *numer = *numer / gcd;
  *denom = *denom / gcd;
}

int getGCD(long a, long b)
{
  int r;
  arrage(&a, &b);
  r = a % b;
  if(r == 0)
    return b;
  else
    return getGCD(b, r);
}

int getLCD(long a, long b)
{
  return a * b / getGCD(a, b);
}