java - Different outputs for same algorithm in different languages -

java source code:

package n1_problem;  /**  *  * @author naws  */ public class loop {      int loop(long i)     {         long n=i;         int count=1;         while(n>1){             if(n%2==0){                 n=n/2;             }             else{                 n=3*n+1;             }             count++;         }        return count;      }      int max_cycle(long j,long k){          int max=-1;         for(long i=j;i<=k;i++){             int count=loop(i);             if(count>max){                 max=count;             }         }         return max;     }   }   public class main {      /**      * @param args command line arguments      */     public static void main(string[] args) {          loop lp=new loop();         system.out.println("max cycle:"+lp.max_cycle(1,1000000));     }  } 

c source code:

int main() {     long r,h;     int f=0;          {         printf("value,r:");         scanf("%ld",&r);         printf("value,h:");         scanf("%ld",&h);          f=max_cycle(r,h);         printf("max:%d\n",f);      }while(getch()!='e'); }  int loop(long i) {         long n=i;         int count=1;         while(n>1)         {             if(n%2==0){                 n=n/2;             }             else{                 n=3*n+1;             }             count++;         }        return count;      }      int max_cycle(long j,long k)     {          int max=1;         long i=0;         for(i=j;i<=k;i++){              int count=loop(i);             if(count>max){                 max=count;             }         }         return max;     } 

there no logical difference between 2 codes 3n+1 problem algorithm.only problem in c gives 476 maximum cycle number in java 525...why??

java defines size , representation of integer types, c not. in java, long 64-bit 2's complement number. in c, @ least 32 bits, perhaps more, , may signed, unsigned, 1's complement, 2's complement, sign , magnitude, or other.

did notice if change line of java code

long n = i; 

to this

int n = (int)i; 

that same result c code? on 2's complement machine , c compiler decided longs 32 bits.