资料来源 : Free On-Line Dictionary of Computing

for loop
     
         A {loop} construct found in many {imperative}
        programming languages which repeatedly executes some
        instructions while a condition is true.
     
        In {C}, the for loop is written in the form;
     
         for (INITIALISATION; CONDITION; AFTER)
           STATEMENT;
     
        where INITIALISATION is an expression that is evaluated once
        before the loop, CONDITION is evaluated before each iteration
        and the loop exits if it is false, AFTER is evaluated after
        each iteration, and STATEMENT is any statement including a
        {compound statement} within braces "{..}" that is executed if
        CONDITION is true.
     
        For example:
     
         int i;
         for (i = 0; i < 10; i++)
         {
           printf("Hello\n");
         }
     
        prints "Hello" 10 times.
     
        The for loop is an alternative way of writing a {while loop}
        that is convenient because the loop control logic is collected
        in a single place.  It is also closely related to the {repeat
        loop}.
     
        (1999-07-07)