Fırat Fırat - 1 month ago 11
Java Question

Print Diamond Shape With Java

I want to print a grid shape on the output console in Eclipse.

Example Diamond Shapes

Basically I took an integer from user that is the number of stars in a single border of the grid.

Here the code I have up to now:

import java.util.Scanner;

public class PrintDiamond {
public static void main(String[] args) {
System.out.print("Enter the number: ");
Scanner scan = new Scanner(System.in);
int num = scan.nextInt();
num--;
for (int i=num; i>0; --i){

//Insert spaces in order to center the diamond
for (int n=0; n<i; ++n){
System.out.print(" ");
}
System.out.print(" *");
for (int n=i; n<num; ++n){
System.out.print(" + ");
System.out.print(" ");
}//Ending bracket of nested for-loop

System.out.println();
}//Ending bracket of for loop

//Print out a diamond shape based on user input
for (int i=0; i<=num; ++i){ //<= to print the last asterisk

//Insert spaces in order to center the diamond
for (int n=0; n<i; ++n){
System.out.print(" ");
}
System.out.print(" *");
for (int n=i; n<num; ++n){
System.out.print(" + ");
System.out.print(" ");
} //Ending bracket of nested for-loop

System.out.println();
} //Ending bracket of for loop

}

}


and the output is(for int. 6):

*
* +
* + +
* + + +
* + + + +
* + + + + +
* + + + +
* + + +
* + +
* +
*

Answer

Here the code:

public static void main(String[] args) {
    System.out.print("Enter the number: ");
    Scanner scan = new Scanner(System.in);
    int num = scan.nextInt();
    final char[][] diamond = makeDiamond(num);
    for (int i = 0; i < diamond.length; i++) {
        for (int j = 0; j < diamond[i].length; j++) {
            System.out.print(diamond[i][j]);
        }
        System.out.println();
    }
}

public static char[][] makeDiamond(int n) {
    int width = 1 + 4 * (n - 1);
    int height = 1 + 2 * (n - 1);
    char[][] out = new char[height][width];
    int x0 = 2 * (n - 1);
    int y0 = n - 1;
    for (int i = 0; i < width; i += 2) {
        // Top borders
        int y1 = Math.abs(y0 - i / 2);
        out[y1][i] = '*';

        // Bottom borders
        int y2 = height - Math.abs(i / 2 - y0) - 1;
        out[y2][i] = '*';

        if ((x0 - i) % 4 == 0) {
            // Plus signs
            for (int j = y1 + 1; j < y2; j++) {
                out[j][i] = '+';
            }
        }
    }
    return out;
}
Comments