c - Determine the largest prime factor -

i'm trying run brute force algorithm determine highest prime factor of number. here's code in c

#include <stdio.h> #include <stdlib.h>    long checkforhighestprime(long param);  int main(){     printf("%ld",checkforhighestprime(600851475143l) );     return exit_success;  }   long checkforhighestprime(long param){          long d= 0;         long h = 0;         long i;      (i = 1; <param; i++){          //check if it's factor          d = param%i;          // if it's factor determine whether prime          if(d == 0){              for(long j = 0; j<i ; j++){                 if (d%j == 0){                     break;                 }else{                     h = d;                 }             }          }     }     return h; } 

however end following error

floating point exception: 8 

what missing?

in inner for loop, initialize j 0. causes d % j == 0 throw exception because attempting divide zero. also, appears d should i.