#include <stdio.h>

/* hasNeg:
 * Given a vector v and integer n,
 * return whether or not one of its first n elements is negative.
 * We assume v has atleast n elements.
 */
bool hasNeg( int v[], int n ) {
  bool retVal = false;
  int i = 0;
  while ( i < n ) {
    if (v[i] < 0)
      retVal = true;
    i = i + 1;
    }

  return retVal;
  } 

/* main:
 * create a vector, fill it with values, then call hasNeg.
 */
int main() {
  const int vSize = 10;

  int i = 0;
  int vec[ vSize ];
  while ( i < vSize ) {
    vec[ i ] = (i - 4) * (i - 7);
    i = i + 1;
    }

  if (hasNeg( vec, vSize ))
    printf( "Some element of v is negative.\n" );
  else
    printf( "No element of v is negative.\n" );

  return 0;
  }