Question

a program on java which can draw for any number odd n a diamond like n=5 +
+++
+++++
+++
+
n + on the line (n+1)/2 and it decrease and increases as above ,just give me the idea of how to write he space -j+4 time System.out.print(" "); (-j+4) times ! please any hints are welcomed

Answer 1

for example n=7
out put is
+ 3 spaces here from the begining
+++ 2 here
+++++ 1here
++++++ non hrer
+++++ 1
+++ 2
+ 3

Answer 2

i'd make 2 loops (1 for the decreasing part and 1 for the increasing part of the diamond). in each loop 2 loops for the + and the space. For the increasing main loop use integer like i = 1, if i < lets say 10, i+=2 it will start with 1 +, next 3 +, next 5 +, 7+ 9+ here it stops because 11+ is higher than 10. so the increasing part of the diamond has n=9

In your case n=5 so you'd set 6 instead of 6.

for the decreasing (lower) part of the diamond use same loop but now set i to a value and decrease the integer with 2. when you set the integer of the upper part to 6, you will get n=5, So you will need so set the lower part on 3 because under the 5+ row you need 3+.

Try this one:

class Diamond {
public static void main(String[] args) {
int x = 6; //the integer for the upper part
int y = 3; // the integer for the lower part
for (int i = 1; i < x; i += 2) {
for (int j = 0; j < 9 - i / 2; j++)
System.out.print(" ");

for (int j = 0; j < i; j++)
System.out.print("+");
System.out.print("\n");
}

for (int i = y; i > 0; i -= 2) {
for (int j = 0; j < 9 - i / 2; j++)
System.out.print(" ");

for (int j = 0; j < i; j++)
System.out.print("+");
System.out.print("\n");
}
}
}

It will output:
+
+++
+++++
+++
+

When you want n=7 you need to set x to 8 and y to 5

Answer 3

you can make it more easy add this
int n = 5;
int x = n+1; //the integer for the upper part
int y = n-2; // the integer for the lower part

It will automatically set x to 6 and y to 3
when you say n=5 it will set x to 8 and y to 5

now you only have to fill in n

Answer 4

i meant n=7 in last post :P

Answer 5

@thomaster there is just one thing my teacher told me that it's not general and I have to make more generalized, because it doesn't work with big numbers like 10001
where you can see just the right side of the diamond but I like this way though thank you for helping ,..

Answer 6

package test;


import java.io.InputStreamReader;
import java.util.Scanner;

public class Test {

private static int n;
private static String data;
private static int input;
private static int i;

public static void main(String[] args) throws Exception {
System.out.println("Helloo I am mounir and I am coming very fast");
System.out.println("write your name"); //for fun~~!!
Scanner name= new Scanner(System.in);
data = name.nextLine();
System.out.println("heloo " + data);
System.out.println("ok " + data + " input an odd number to get a diamond");
Scanner sc= new Scanner (System.in);
int n= sc.nextInt();
int x = n+1; //the integer for the upper part
int y = n-2; // the integer for the lower part
for (int i = 1; i < x; i += 2) {
for (int j = 0; j < 9 - i / 2; j++)
System.out.print(" ");
for (int j = 0; j < i; j++)
System.out.print("+");
System.out.print("\n");
}
for (int i = y; i > 0; i -= 2) {
for (int j = 0; j < 9 - i / 2; j++)
System.out.print(" ");
for (int j = 0; j < i; j++)
System.out.print("+");
System.out.print("\n");
}
if (n%2==0 ){
System.out.println("will nice if you input an odd number any way see you "+data);
}
else
{
System.out.println("hope you like this thank you " +data+ " see you soon");
}
}
}

Answer 7

uhh if you replace this:

for (int j = 0; j < 9 - i / 2; j++)
System.out.print(" ");

by this: (for both space loops)

for (int j = 0; j < n - i / 2; j++)
System.out.print(" ");

will it then work?

Answer 8

perfectly did work thank you again .