Java 创建 X 框的循环和 If 条件

Question

enter image description here How to print a big X made up of small X Box which I have provided the code below. The size of the X must be equal to the size of the small X Box.

System.out.print("Enter the desired cube size: "); 
int size = new Scanner(System.in).nextInt();

for(int row=1; row<=size; row++) {
    for(int col=1; col<=size; col++) {
        if (row == 1 || row == size || col == 1 || col == size || col == row ||col == size-(row-1)) {
            System.out.print("X ");
        }else {
            System.out.print("  ");
        }
    }
    System.out.println();
}

The output should look like this. The size of the big X must be equal to the small one. Like this, the given size is 3.

X X X     X X X
X   X     X   X
X X X     X X X
     X X X 
     X   X
     X X X
X X X     X X X
X   X     X   X
X X X     X X X

Answer 1

If I have not misunderstood you, when you insert the size keyboard you should always print five mini "x" in size -> size * size. By retouching your code, I changed the loops for(), size*3, and the line of the if..else. Where if (), if we have a square, we will divide it into 9 parts. If we are in the corners or in the center, we will print on screen "X ", if not, " ".

public static void main(String[] args) {

    // TODO Auto-generated method stub
    System.out.print("Enter the desired cube size: "); 
    int size = new Scanner(System.in).nextInt();

    for(int row=0; row<(size*3); row++) {
        for(int col=0; col<(size*3); col++) {
            if ((row/size!=1 && col/size!=1) || (row/size==1 && col/size==1)) {
                System.out.print("X ");
            }else {
                System.out.print("  ");
            }
        }
        System.out.println();
    }

}

This will return the following content: program exit

 X X X       X X X 
 X X X       X X X
 X X X       X X X
       X X X 
       X X X
       X X X
 X X X       X X X
 X X X       X X X
 X X X       X X X

What I have not implemented is the white space in the center of the small squares. Since, if it is not fulfilled that there is a center, which one would remain blank? The case: size = 4 for example

 X X X X         X X X X 
 X X X X         X X X X
 X X X X         X X X X
 X X X X         X X X X
         X X X X 
         X X X X
         X X X X
         X X X X
 X X X X         X X X X
 X X X X         X X X X
 X X X X         X X X X
 X X X X         X X X X

If you want small Xs to have only one "X" border, you have to add the following condition to the if..else instruction:

for(int col=0; col<(size*3); col++) {
    if ((((row/size!=1 && col/size!=1)) || (row/size==1 && col/size==1)) && 
       (row%size==0 || col%size==0 || row%size==size-1 || col%size==size-1)) {
        System.out.print("X ");
    }else {
        System.out.print("  ");
    }
}

Where if row or column, are in module 0 or size-1 of size, is that they are on the edge of the small X.

and the result is:

 X X X X         X X X X 
 X     X         X     X
 X     X         X     X
 X X X X         X X X X
         X X X X 
         X     X
         X     X
         X X X X
 X X X X         X X X X
 X     X         X     X
 X     X         X     X
 X X X X         X X X X

I do not know if it has been completely clear, it is my first post and I have tried to explain the best I know.

Answer 2

You could try something like this:

public static void main(String[] args) {
    System.out.print("Enter the desired cube size: ");
    int size = new Scanner(System.in).nextInt();

    for (int row = 1; row <= size; row++) {
        printRow(size, row);
    }
}

private static void printRow(int size, int row) {
    for (int i = 0; i < 3; ++i) {
        printRow(size, row, i);
        System.out.println();
    }
}

private static void printRow(int size, int row, int subrow) {
    for (int i = 1; i <= size; ++i) {
        if (i == row || i == size-row+1) {
            if (subrow == 1) {
                System.out.print("X X");
            } else {
                System.out.print("XXX");
            }
        } else {
            System.out.print("   ");
        }
    }
}