If the condition evaluates to FALSE or NULL, the loop is bypassed, and control passes to the next statement.
如果条件的求值结果为FALSE或NULL,那么将绕过循环,并且控制被传递给下一条语句。
So it's a sufficient condition for an argument being valid that there is no possible situation where the premises are true and the conclusion false. And that's a necessary condition too.
所以这对于论点有效性是充分条件,没有可能前提为真,结论为假,这是必要条件。
When that condition is false, that is, the page counter is either less than the start page or greater than the end page, it does not write any output.
当那个条件为假(也就是说,页计数器的值小于起始页或大于结束页)时,则selpg不再写任何输出。
And as soon as this condition or these conditions evaluate to false, the whole loop terminates.
一旦这个条件或这些条件不成立,整个循环终止。
So in other words, if thankful is still false at this point, it means this condition did not work out very well, and so I'm going to do this block of code again.
换句话说,如果thankful在这时候还是false值,这表示这个条件没有实现地很好,所以我将再次去处理这段代码。
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