Inner variable shadows outer variable : Variable Scope « Language « C Tutorial

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3. Variable Scope

#include <stdio.h>
int main(void)
{
  int count = 0;                                
  do
  {
    int count = 0;                
    ++count;                      
    printf("\ncount = %d ", count);
  }
  while( ++count <= 8 );  /* This works with outer count */

  /* this is outer */
  printf("\ncount = %d\n", count);
  return 0;
}

count = 1
     count = 1
     count = 1
     count = 1
     count = 1
     count = 1
     count = 1
     count = 1
     count = 1
     count = 9