我似乎不明白为什么我的循环不会继续

Question

我似乎不明白为什么我的for循环不能工作。我已经在网上呆了大约一个小时了，离我最近的就是这个。我正在尝试找出使用6、9和20包可以买到多少McNuggets。我需要dopeChecker(x)做的就是返回true或false。我还没有实现检查下一个数字，因为它甚至不会发现6包还可以购买。我知道它在某个地方，但我就是找不到。这是麻省理工学院公开课的问题2，我不知道你们有没有看过，但我只是想让你们知道，这就是我获取信息的地方。

int x = 0, y = 0, z = 0;// These will the the pack of McNuggets that we can buy.
int testFor = 0; //This will be the number of McNuggets we are looking for.
int matches = 0; //This will be the number of consecutive matches we will be looking for.

public void dopeEquation(){

    while (matches < 6){//It's 6 Because that is the smallest order of nuggets we can buy.

        //Looking for smaller nuggets then we can buy would not make sense. 
        while (testFor < 6){
            testFor++;
        }

        if (dopeChecker(testFor)){
            matches++;

        } else{
            matches = 0;
            System.out.println(x + "," + y +"," + z +"," + testFor + "," + matches);
        }

    }
}

private boolean dopeChecker(int testFor){

    for (  x = 0 ; x*6 <= testFor;  x++){
        for ( y = 0 ; y*9 <= testFor;  y++){
            for (z = 0 ; z*20 <= testFor;){
                System.out.println(x + "," + y +"," + z +"," + testFor + "," + matches);

                if (x*6 + y*9 + z*20 == testFor){
                    matches++;
                    System.out.println("match");
                    return true;
                }else{
                    System.out.println("no match");
                }
            }
        }

    }
    return false;

}
}

Answer 1

您的代码放在第一个while循环中：

while (matches < 6){

然后使用以下代码将testFor增加到6：

 while (testFor < 6){
            testFor++;
        }

然后转到dopeChecker：

 dopeChecker(int testFor)

然后插入第三个循环，对于z：

 for (z = 0 ; z*20 <= testFor;) {
 ...
 }

Z永远不会递增，因此您需要将其写为：

 for (z = 0 ; z*20 <= testFor; z++){
}

Answer 2

Z变量始终为0，您不能更改它。

Answer 3

下面是最里面的for循环。我已经评论了问题所在。如您所见，z从未实现过。因此，从testFor >= 6开始，循环将永远不会终止，因为0 <= TestFor。

        for (z = 0 ; z*20 <= testFor;/* incrementor needed here*/){
            System.out.println(x + "," + y +"," + z +"," + testFor + "," + matches);

            if (x*6 + y*9 + z*20 == testFor){
                matches++;
                System.out.println("match");
                return true;
            }else{
                System.out.println("no match");
            }
        }