The FOR keyword.

Basic principles

	main()
        {
	   int count=1;

	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
	   printf("%d\n", count++);
        }

	main()
        {
	   int count;

           for ( count=1 ; count <= 10 ; count++) printf("%d\n", count);
        }

Repeating several lines of code

	main()
        {
	   int count, sqr;

           for ( count=1 ; count <= 10 ; count++) 
           {
	      sqr=count * count;
              printf( " The square of");
	      printf( " %2d", count);
	      printf( " is %3d\n", sqr);
           }
        }

More detail

	for (expression_1 ; expression_2 ; expression_3) statement ;

1. Executes expression_1.

2. Executes statement.
3. Executes expression_3.
4. Evaluates expression_2.
   • If TRUE, Jumps to item 2.
   • If FALSE, Stops looping.

The following example is an infinite loop:

	main()
	{
	   for( ; ; ) puts(" Linux rules!");
	}

Examples: