根据参数循环的被调用函数 [英] Called function that loops depending on the argument

问题描述

我有一个函数 LED_MAIN()，它的工作是通过调用另一个函数 LED_MAIN_LINE() 来点亮 LED，这是它的私有函数，这意味着我在测试时我只会调用 LED_MAIN() 的代码.

I have a function LED_MAIN() whose work is to light up LEDs by calling upon another function LED_MAIN_LINE() which is private to it, meaning when I am testing the code I will only call LED_MAIN().

void LED_MAIN (void)            //main function (public) to light all LEDs
{
    int i;
    int LED_NO_UP = 10 ;                 //number of LEDs on line going up
    int LED_NO_DOWN = 10;            //number of LEDs on line coming down
    void LED_MAIN_LINE ( int no );   //private function to light LEDs on either side i.e on line going up and on line coming down


    for (i=0 ; 1<20 ; i++)              //first eliminate any errors in all 20 LEDs
    {
        LED_ERROR [i] = 0;
    }

    for ( i=0 ; i<LED_NO_UP ; i++ )     //light LEDs on one side. MAX 10 LEDs. LEDs #1-10
    {
        LED_MAIN_LINE (i);
    }

    for ( i=0 ; i<LED_NO_DOWN ; i++ )   //light LEDs on the other side. LEDs #11-20
    {
        LED_MAIN_LINE (i+10);
    }
}

void LED_MAIN_LINE ( int no )   //definition of the actual LED lighting function (private to void LED_MAIN (void))
{
   //currently no reference to argument int no in this function 

    for (i = 10 ; i > 0 ; i++)
        {
            led_status [no][i] = led_status [no] [i-1]
        }
        // continued......
}

LED_MAIN_LINE() 应该为每个存在的 LED 执行.如果任一行上有 10 个 LED，它将循环 20 次 (10x2).如果有 5 个 LED，它只会执行 5 次 &很快.参数是 LED 的数量.然而，它被 void LED_MAIN() 调用，这就是循环发生的地方.

LED_MAIN_LINE() is supposed to be executed for every LED that there is. If there are 10 LEDs on either line, it will loop 20 times (10x2). If there are 5 LEDs it will only be executed 5 times & so on. The argument is the number of LEDs. However, it is being called by void LED_MAIN() and this is where the looping will happen.

但是，查看我对 void LED_MAIN_LINE() 的定义，我没有传递 LED 数量的参数.我已经在 LED_MAIN() 中做到了这一点.我想知道，这个定义是否正确?我应该在哪里传递预期使 LED_MAIN_LINE() 循环的 LED 数量?使用当前代码，我的测试结果不如预期.

Looking at my definition of void LED_MAIN_LINE() however, I have not passed an argument for the number of LEDs. I have done this in LED_MAIN(). I wonder, is this definition correct? Where should I pass the number of LEDs expected to make LED_MAIN_LINE() loop? With the current code my test results are not as expected.

推荐答案

LED_NO_UP 和 LED_NO_DOWN 为 0.所以代码中的 for 循环永远不会执行，因为 i <当 i = 0 时，0 是不可能的.

LED_NO_UP and LED_NO_DOWN are 0. So the for loops in your code are never executed because i < 0 is not possible when i = 0.

在第一个 for 循环中还有 1<20.

Also you have 1<20 in the first for loop.

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