Why run time error in the given code??


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Besides my code here is also getting the same error (although it compiles and runs fine on my mac gcc) for the same input (here the input which failed is 6):// http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
int countPrimes(int n) {
int *arr, n2, i, j, k = 0;
int count = 0;if (n <= 1) return 0; if (n <= 3 ) { return n1; } arr = (int *)malloc(n * sizeof(int)); for (i = 0 ; i < n ; i++) { arr[i] = i; } for (i = 2 ; i < n ; i++) { j = k = arr[i]; if (arr[k] == 0) { continue; } while(k <= n) { if (arr[k] == 0) { k = k + j; continue; } if (k != j) arr[k] = 0; k = k + j; } } for (i = 2 ; i < n ; i++) { if (arr[i] != 0) count++; } free(arr); return count;
}