LOOP+GPIO[C]

#include <stdio.h>

int main()
{
  int x = 0;  /* Don't forget to declare variables */
  int column;
    for(column = 0; column < 4; column++){

      printf( "GPIO_Pin_%d\n", column );
      x++;             /* Update x so the condition can be met eventually */
  }
  getchar();
}