Answer L2

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

/* Puzzle L02 -- print the integers from 1 to 15, one per line */
int main(int argc, char *argv[])
{
  int j;
  for (j=1; j<=15; j++ )
  {
    printf("%3d\n", j);
  }

  return 0;
}

Comments: It also works to use this for statement:

  for (j=1; j<16; j++ )

Here is an inferior solution to the problem because it does something needlessly tricky for no particular benefit. The trick is that it uses the last value assigned to j, 15, outside of the loop.

/* Puzzle L02 -- print the integers from 1 to 15, one per line 
|  Bad Solution.
*/
int main(int argc, char *argv[])
{
  int j;
  for (j=1; j<15; j++ )
  {
    printf("%3d\n", j);
  }
  printf("%3d\n", j);  /* The "trick" */

  return 0;
}

Although this is an awful way to write the program, you should understand how it works. The variable j is incremented to 15 the last time the loop body is executed. It keeps this value, even though the loop is finished.