Strange Bug: loop counter not incrementing in for loop

Hello !

I never experienced such issues with GCC ... Are you sure that your code doesn't touch the i in the "//Do something" part ?

Regards,
Benoît

try pasting the real code that you have issue with.

Ok. I will paste here the functions fun1 and fun2 that are causing the problem. The other functions are working fine. I am trying to code the Viterbi decoder (trying to implement Convolutional encoder-decoder). These are as follows:

#include <stdio.h>
#include <stdlib.h>

//n=no of outputs; K=register size; k=input bits;
const int n=2, K=3;
struct node{
 struct node *prev0;
 struct node *prev1;
 int state[2], weight;
 struct node *next0;
 struct node *next1;
};

typedef struct node NODE;

NODE *head, *tail, *current;

// Left =next0; Right= next1;

NODE* leftnext(NODE *now);
NODE* rightnext(NODE*now);

void decoder(int input[]);

void go_prev(NODE*);

void printleft(void);
void printright(void);

void gonextstate(int);
void getnextstate(int currstate[], int input);

int hammingDist(int a1[], int a2[]); //function causing trouble

//int regstate[ ]={0,0}
int g1[ ]={1,1,1}, g2[ ]={1,0,1},output[ ]={0,0};

main(){
 int i, inputlength=9, input[ ]={1,1};

 decoder(input);//Calling decoder here.
 printf("\n");
}
void decoder(int input[]){
 int i,j, count;

 NODE *currentT[4], *prevT[4], *nextT[4], *current;

 for(i=0;i<4;i++){
  currentT[i]=prevT[i]=nextT[i]=NULL;
 }

 head=(NODE *) malloc(sizeof(NODE));
 head->prev0=NULL;
 head->prev1=NULL;
 head->state[0]=2;
 head->state[1]=0;
 head->weight=-999;
 head->next0=NULL;
 head->next1=NULL;
 //current=tail=head;
 currentT[0]=head;

 count=0;
 for(i=0; i<4; i++){
  if(currentT[i] !=NULL){
   // for left node
   currentT[i]->next0=leftnext(currentT[i]);
   printf("Weight: %d", currentT[i]->next0->weight);
   if(count!=0){
    for(j=0; j<=count; j++){
     if(hammingDist((currentT[i])->next0->state, nextT[j]->state)==0)//Calling the hamming distance here.
      break;
    }
    currentT[i]->next0=nextT[j];
   }
   else
    nextT[count]=current->next0;

   // for right node
   currentT[i]->next1=rightnext(currentT[i]);
   if(count!=0){
    for(j=0; j<=count;j++){
     if(hammingDist(currentT[i]->next1->state, nextT[j]->state)==0)//Calling Hamming distance here.
      break;
    }
    currentT[i]->next1=nextT[j];
   }
   else
    nextT[count]=current->next1;
  }
 }

 printf("count: %d\n", count);
 //go_prev(current);
 go_prev(nextT[0]);

 printf("\n");
}

int hammingDist(int a1[], int a2[]){
 int i, sum[1];
 for(i=0; i<2; i++){ //Here this 'i' is giving trouble
  if (((a1[i]) == 0 && (a2[i] == 1)) || ((a1[i] == 1) && (a2[i] == 0)))
   sum[i] = 1;
  else
   sum[i] = 0;

  //printf("hammingDist-i: %d ",p);
 }

 return sum[0] + sum[1];
}

  We tried replacing the 'for' loop with 'while'. But we could not get rid of the problem.
  Is this information sufficient? I am ready to provide the entire code but it is under construction. So there will be other errors.

Sorry, I only know Java and this is a little over my head.