CODEWITHSUNDEEP
javafor-loopnested
DPabst
DPabst

Reputation: 35

Add a space between every number using loops?

I'm trying to get a single line to output and look somewhat like this:

1 2  3   4    5     6      7       8        9

Adding another space every time the number increases. I need to do it using for loops, with a nested for loop being preferred. Here's my code so far (on run it doesn't print even with the method call.)

public static void outputNine()
{
    for(int x=1; x<=9; x++)
    {
        for(char space= ' '; space<=9; space++)
        {
            System.out.print(x + space);
        }
    }
}

I know I'm doing something wrong, but I'm fairly new to java so I'm not quite sure what. Thanks for any help.

Upvotes: 0

Views: 7287

Answers (6)

Mohit Miglani
Mohit Miglani

Reputation: 41

Please find my simple solution:)

public class Test {

    public static void main(String args[]) {
        for (int i = 1; i <= 9; i++) {
            for (int j = 2; j <= i; j++) {
                System.out.print(" ");
            }
            System.out.print(i);
        }

    }

}

Upvotes: 0

xiaofeng.li
xiaofeng.li

Reputation: 8587

Consider the line as composed of 9 parts of the same structure: x-1 spaces followed by x, where x change from 1 to 9.

/*
0 space + "1"
1 space + "2"
2 spaces + "3"
...
*/

int n = 9;
for (int x = 1; x <= n; x++) {
    // Output x - 1 spaces
    for (int i = 0; i < x - 1; i++) System.out.append(' ');
    // Followed by x
    System.out.print(x);
}

One good thing about this approach is you don't have trailing spaces.

Upvotes: 0

OneCricketeer
OneCricketeer

Reputation: 191710

You only need one loop.

Refer: Simple way to repeat a String in java

for (int i = 1; i <= 9; i++) {
    System.out.printf("%d%s", i, new String(new char[i]).replace('\0', ' '));
}

Output

1 2 3 4 5 6 7 8 9

Or more optimally, 

int n = 9;
char[] spaces =new char[n];
Arrays.fill(spaces, ' ');
PrintWriter out = new PrintWriter(System.out);

for (int i = 1; i <= n; i++) {
    out.print(i);
    out.write(spaces, 0, i);
}
out.flush();

Upvotes: 0

ROMANIA_engineer
ROMANIA_engineer

Reputation: 56636

You can initialize space only once, then print the numbers, and for every number, print the spaces:

char space = ' ';
for(int x=1; x<=9; x++)
{
    System.out.print(x);
    for(int i = 0 ; i < x ; i++)
    {
        System.out.print(space);
    }
}

Upvotes: 2

shmosel
shmosel

Reputation: 50716

Your loop is using the ASCII value of ' ', which isn't what you want. You just need to count up to the current x. Replace your inner loop with this:

System.out.print(x);
for (int s = 0; s < x; s++) {
    System.out.print(" ");
}

Upvotes: 0

bluecanary
bluecanary

Reputation: 81

Right now you're trying to increment a char, which doesn't make sense. You want space to be a number equivalent to the number of spaces you need.

Upvotes: 0

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