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19.6.5 Example of for

Here is the for statement from the iterative Fibonacci function: 

int i;
for (i = 1; i < n; ++i)
  /* If n is 1 or less, the loop runs zero times,  */
  /* since i < n is false the first time.  */
  {
    /* Now last is fib (i)
       and prev is fib (i - 1).  */
    /* Compute fib (i + 1).  */
    int next = prev + last;
    /* Shift the values down.  */
    prev = last;
    last = next;
    /* Now last is fib (i + 1)
       and prev is fib (i).
       But that won’t stay true for long,
       because we are about to increment i.  */
  }

In this example, start is i = 1, meaning set i to 1. continue-test is i < n, meaning keep repeating the loop as long as i is less than n. advance is i++, meaning increment i by 1. The body is a block that contains a declaration and two statements.