Java中使用for循环的等边三角形

我试图画一个由星号字符组成的等边三角形，但当用户输入行号时，该行将被画成x，整个三角形将是*但空格中有一个错误

这是我的密码：

int number_of_stars = getHeight();
for (int rows=1; rows <= getHeight(); rows++) 
       {
        for (int spaces=1; spaces <= number_of_stars; spaces++) 
        {
            System.out.print(" ");
        }

        if(rows == getRowNum()){
            for (int star=1; star <= rows; star++) 
            {
                System.out.print("x");
                System.out.print(" ");
                }
            System.out.println("");
            rows = getRowNum()+1;
            System.out.print(" ");
            System.out.print(" ");
            System.out.print(" ");

        }
        for (int star=1; star <= rows; star++) 
        {
            System.out.print("*");
            System.out.print(" ");
            }
        System.out.println("");
        number_of_stars = number_of_stars - 1;
        }

---

第九行和第十行不正确

我相信您想要一个简单的if-else，当您添加一个额外的循环来打印xs时，它取消了对齐。我想你只是想

public static void main(String[] args) {
    int number_of_stars = getHeight();
    for (int rows = 1; rows <= getHeight(); rows++) {
        for (int spaces = 1; spaces <= number_of_stars; spaces++) {
            System.out.print(" "); // <-- indent(s)
        }
        for (int star = 1; star <= rows; star++) {
            if (rows == getRowNum()) {
                System.out.print("x"); // <-- one row is "x"
            } else {
                System.out.print("*"); // <-- others are "*"
            }
            System.out.print(" ");
        }
        System.out.println("");
        number_of_stars = number_of_stars - 1;
    }
}

---

对于特定的行号，您要做的唯一更改是打印x而不是*并且您可以简单地将字符更改为打印。我尝试了以下示例代码：

public static void main(String[] args) {
        int userRowNumber = 5;
        int height = 10;
        int number_of_stars = height;
        String charToPrint;
        for (int rows=1; rows <= height; rows++)
        {
            charToPrint = "*";
            if(rows == userRowNumber){
                charToPrint = "x";
            }
            for (int spaces=1; spaces <= number_of_stars; spaces++)
            {
                System.out.print(" ");
            }
            for (int star=1; star <= rows; star++)
            {
                System.out.print(charToPrint);
                System.out.print(" ");
            }
            System.out.println("");
            number_of_stars = number_of_stars - 1;
        }
    }

---

打印出预期的内容。对于代码中的问题，我建议您自己调试并找出答案。

现在是启动调试器并逐步执行的正确时机。

public static void main(String[] args) {
    int number_of_stars = getHeight();
    for (int rows = 1; rows <= getHeight(); rows++) {
        for (int spaces = 1; spaces <= number_of_stars; spaces++) {
            System.out.print(" "); // <-- indent(s)
        }
        for (int star = 1; star <= rows; star++) {
            if (rows == getRowNum()) {
                System.out.print("x"); // <-- one row is "x"
            } else {
                System.out.print("*"); // <-- others are "*"
            }
            System.out.print(" ");
        }
        System.out.println("");
        number_of_stars = number_of_stars - 1;
    }
}

public static void main(String[] args) {
        int userRowNumber = 5;
        int height = 10;
        int number_of_stars = height;
        String charToPrint;
        for (int rows=1; rows <= height; rows++)
        {
            charToPrint = "*";
            if(rows == userRowNumber){
                charToPrint = "x";
            }
            for (int spaces=1; spaces <= number_of_stars; spaces++)
            {
                System.out.print(" ");
            }
            for (int star=1; star <= rows; star++)
            {
                System.out.print(charToPrint);
                System.out.print(" ");
            }
            System.out.println("");
            number_of_stars = number_of_stars - 1;
        }
    }