用“！！”反向金字塔java模式

Question

我想做这个图案：

!!!!!!!!!!!!!!!!!!!!!!
\\!!!!!!!!!!!!!!!!!!//
\\\\!!!!!!!!!!!!!!////
\\\\\\!!!!!!!!!!//////
\\\\\\\\!!!!!!////////
\\\\\\\\\\!!//////////

for (j = 1; j <= i; j++ ){
    System.out.print("\\\\");
}

for (j = 1; j <= i; j++ ){
    System.out.print("//");
}

两个for循环都在如下所示的for循环中：

public static void main(String[] args) {
    //input should be customizable, like 4, 6, 8, 43 and so on
    int input = 4;
    for (int i = 0; i < input; i++){

        //left side slashes
        for (int j = 1; j <= i; j++ ){
            System.out.print("\\\\");
        }
        //Here is the problem. It almost works like supposed to, just a on Line 2 appears 1 "!!" to much, then on line 1 there is 2 "!!" too much.
        for (int k = input - i; k > 0; k--){
            for(int l = 0; l < k; l++){
                System.out.print("!!");
            }
        }

        //right side slashes 
        for (int j = 1; j <= i; j++ ){
            System.out.print("//");
        }
        //Line breaks
        System.out.println();
    }
}

Answer 1

您可以使用类String的repeat方法来简化代码。那么这只是一个计算你需要多少字符的问题。

public class Pyramid {
    public static void main(String[] args) {
        int n = 6;
        if (args.length > 0) {
            n = Integer.parseInt(args[0]);
        }
        
        for (int i = 0; i < n; i++) {
            System.out.println("\\\\".repeat(i) + "!!".repeat(2 * (n - i) - 1) + "//".repeat(i));
        }
    }
}

java Pyramid

!!!!!!!!!!!!!!!!!!!!!!
\\!!!!!!!!!!!!!!!!!!//
\\\\!!!!!!!!!!!!!!////
\\\\\\!!!!!!!!!!//////
\\\\\\\\!!!!!!////////
\\\\\\\\\\!!//////////

当然，对于循环，您仍然可以用替换对repeat的调用，现在您应该看到问题了：中间的！！字符不需要两个嵌套循环。

public class Pyramid {
    public static void main(String[] args) {
        int n = 6;
        if (args.length > 0) {
            n = Integer.parseInt(args[0]);
        }
 
        for (int i = 0; i < n; i++) {

            // Left side slashes
            for (int j = 0; j < i; j++) {
                System.out.print("\\\\");
            }
            
            for (int j = 2 * (n - i) - 1; j > 0; j--) {
                System.out.print("!!");
            }

            // Right side slashes 
            for (int j = 0; j < i; j++) {
                System.out.print("//");
            }

            // Line break
            System.out.println();
        }
    }
}