#include <stdio.h>

#define LENGTH 16

void makeBranches(int, int);
void display(int, int);

int main(){

  makeBranches(0, LENGTH-1);
}

void makeBranches(int left, int right){

  if(left >= right){
    return;
  } else{
    display(left, right);
    makeBranches(left, (right+left)/2);
    makeBranches((right+left/2)+1, right);
  }
}

void display(int left, int right){
  printf("%d, %d", left, right);
  int mid = (left+right)/2;
  int i;

  for(i = left; i <= right; i++){
    if(i == mid)
      printf("X");
    else
      printf("-");
  }

  if(right == LENGTH-1)
    printf("\n");

}

The problem that I am having is the second call of makeBranches only executes with the values that caused the first call of makeBranches to return and not the original values that the first call used.