Repetition - For

The for expression continues to evaluate the given statements until the completion criteria is met. Formally,

  for ( initialization expr; completion expr; increment ) {
    statement;
  }

Any number of statements can be in the initialization or increment steps as long as they are simple and separated by commas. The completion statement must result in a boolean value that determines when to end the loop. Example:

  /*
   * loop from 1 to 10 
   */
  int i;

  printf ( "i =" );

  for ( i = 0; i < 11; i++ ) {
    printf ( " %d", i );
  }

  printf ( "\n" );

produces

i = 0 1 2 3 4 5 6 7 8 9 10

And a slightly more complex loop

  /*
   * loop from 1 to 10 
   */
  int i, j;

  for ( i = 0, j = 1; j < 11; i++, j++ ) {
    printf ( "i = %d, j = %d\n", i, j );
  }

produces

i = 0, j = 1
i = 1, j = 2
i = 2, j = 3
i = 3, j = 4
i = 4, j = 5
i = 5, j = 6
i = 6, j = 7
i = 7, j = 8
i = 8, j = 9
i = 9, j = 10