c - Highest difference between two consecutive prime numbers -


this simple program, written in c, asks user int n.
what's best way of finding highest difference between 2 consecutive prime numbers range 2 n?

int main() {     int n, i, j, c;     clrscr();     printf("enter range print prime numbers:");     scanf("%d", &n);     printf("prime numbers following:\n");     for(i=1, c=0; i<=n; i++) {         (j=1; j<=i; j++)             if (i % j == 0)                 c++;         if (c == 2)             printf("%d ", i);     }      printf("\n\n highest difference between numbers is:");      /* logic cant */     getch(); }

keep track of largest difference between 2 consecutive prime numbers in variable , if new difference larger, replace variable new difference.

int maxdifference = 0; int currentdifference;  // begin looping currentdifference = calculatenewdifference();  if(currentdifference > maxdifference) {     maxdifference = currentdifference; }

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