java - Can't see where I'm dividing by 0? -


here code think need able asses problem

1 import.java.util.scanner 2 public class ccattano_sieve{ 3         private boolean []  primes = new boolean [50001]; 4         private int upper; 5         private int lower; 6  7         public ccattano_sieve(){ 8             upper = 50000; 9             lower = 1; 10            (int = 2; < primes.length; i++){ 11                primes[i] = true; 12            } 13            primes[0] = false; 14            primes[1] = false; 15        } 16  17        public void processsieve(){ 18            (int = 2; < math.round(math.sqrt(50000)); i++){ 19                if (primes[i] == true){ 20                    (int c = 2; c < (primes.length - 1); i++){ 21                        if (c % == 0){ 22                            primes[c] = false; 23                        } 24                        else{ 25                            primes[c] = true; 26                        } 27                    } 28                } 29            } 30        }

i'm pretty sure else statement on lines 24 - 26 aren't needed added when trying trouble shoot. on line 21 when trying run code receive divide 0 error. exact error follows.

exception in thread "main" java.lang.arithmeticexception: / 0 @ ccattano_sieve.processsieve(ccattano_sieve.java:21) @ ccattano_sievetest.main(ccattano_sievetest.java:7)

this line "at ccattano_sievetest.main(ccattano_sievetest.java:7)" calls code pasted can ignored. line 21 main issue , can't find solution.

the modulus operator "rest of division" meaning involves division.

i believe have bug on line 20 incrementing instead of c. means variable overflow (reach high turn negative) , turn 0.


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