Java nest For Loop help

[SlaughterApollo]

I'm having a small issue with a program from school. I need to use a nested for loop (A for loop inside another) to output the following.

 

Any help is greatly appreciated

 

                                           1

                                   1       2     1

                            1     2       4     2     1

                     1     2     4        8    4     2     1

               1    2     4     8      16    8     4     2    1

          1   2    4     8    16     32   16    8     4    2   1

     1   2   4    8    16   32     64   32   16    8    4   2   1

1   2   4   8   16   32   64   128   64   32   16   8   4   2   1

[nsyedhasan]

What is the problem? @SlaughterApollo

[79wjd]

@SlaughterApollo 
 
This will print half of the triangle.

int numberOfLines = 8; //based on the image you postedif(numberOfLines >= 1){    for(int spaces=0; spaces < numberOfLines; spaces++){        System.out.print(" ");    }    System.out.print("1");    for(int spaces=0; spaces < numberOfLines; spaces++){       System.out.print(" ");    }    System.out.println();}for(int i=1; i<numberOfLines ; i++){    for(int k=0; k<numberOfLines-i-1; k++){        System.out.print(" ");    }     for(int j=1; j<=(Math.pow(2, i)) ; j*=2){        System.out.print(j + " ");     }    System.out.println();}

        1              1 2      1 2 4     1 2 4 8    1 2 4 8 16   1 2 4 8 16 32  1 2 4 8 16 32 64 1 2 4 8 16 32 64 128

[SlaughterApollo]

 

@SlaughterApollo 

 

This will print half of the triangle without the preceding spaces. 

int numberOfLines = 8; //based on the image you postedif (numberOfLines >=1) System.out.println("1"); for(int i=1; i<numberOfLines ; i++){      for(int j=1; j<=(Math.pow(2, i)) ; j*=2){          System.out.print(j + " ");       }       System.out.println();}

Output:11 2 1 2 4 1 2 4 8 1 2 4 8 16 1 2 4 8 16 32 1 2 4 8 16 32 64 1 2 4 8 16 32 64 128 

i got the math but the spacing is messing me up

public class Chp4_19 {	public static void main(String[] args) {		for(int x = 0; x < 8; x++)		{		for(int y = 8 - x; y> 0; y--)		{		System.out.print(" ");		}		int w = 1;		for(int z = 0; z < x; z++)		{		System.out.print(w + " ");		w = w * 2;		}		while(w>0)		{		System.out.print(w + " ");		w = w / 2;		}		System.out.println();		}	}}

[79wjd]

 

i got the math but the spacing is messing me up

Add an extra space to the print statement on line 9, that fixes the spacing until double digit numbers come into play, so once you get a double digit number you have to reduce the spacing by one. 

 

for(int x = 0; x < 8; x++)

{

for(int y = 8 - x; y> 0; y--)

{

System.out.print("    ");

}

int w = 1;

for(int z = 0; z < x; z++)

{

if(w<10){

System.out.print(w + "   ");

w = w * 2;

}

else if(w<100){

System.out.print(w + "  ");

w = w * 2;

}

else{

System.out.print(w + " ");

w = w * 2;

}

}

while(w>0)

{

if(w<10){

System.out.print(w + "   ");

w = w / 2;

}

else if(w<100){

System.out.print(w + "  ");

w = w / 2;

}

else{

System.out.print(w + " ");

w = w / 2;

}

}

System.out.println();

}

[Deprecated]

Something like this?

 

/** * Created by Tyler on 2014/10/05. */public class Test {    private static final int POWER_COUNT = 8;    private static final int MAX_SPACING = getNumberOfDigits(Math.pow(2, POWER_COUNT));    public static void main(final String... args) {        for (int line = 0; line < POWER_COUNT; line++) {            for(int i = line - POWER_COUNT + 1; i < line; i++) {                if (i >= 0) {                    print((int) Math.pow(2, i));                } else {                    print(null);                }            }            print((int) Math.pow(2, line));            for(int i = line - 1; i > line - POWER_COUNT; i--) {                if (i >= 0) {                    print((int) Math.pow(2, i));                } else {                    print(null);                }            }            System.out.println();        }    }    private static void print(Integer num) {        if (num == null) {            for (int i = 0; i < MAX_SPACING+1; i++) {                System.out.print(" ");            }        } else {            int numSize = getNumberOfDigits(num);            System.out.print(" " + num);            for (int i = 0; i < MAX_SPACING - numSize; i++) {                System.out.print(" ");            }        }    }    private static int getNumberOfDigits(double num) {        return (int) (Math.log10(num)) + 1;    }}

Output

                             1                                                       1   2   1                                               1   2   4   2   1                                       1   2   4   8   4   2   1                               1   2   4   8   16  8   4   2   1                       1   2   4   8   16  32  16  8   4   2   1               1   2   4   8   16  32  64  32  16  8   4   2   1       1   2   4   8   16  32  64  128 64  32  16  8   4   2   1  

[SlaughterApollo]

Something like this?

 

/** * Created by Tyler on 2014/10/05. */public class Test {    private static final int POWER_COUNT = 8;    private static final int MAX_SPACING = getNumberOfDigits(Math.pow(2, POWER_COUNT));    public static void main(final String... args) {        for (int line = 0; line < POWER_COUNT; line++) {            for(int i = line - POWER_COUNT + 1; i < line; i++) {                if (i >= 0) {                    print((int) Math.pow(2, i));                } else {                    print(null);                }            }            print((int) Math.pow(2, line));            for(int i = line - 1; i > line - POWER_COUNT; i--) {                if (i >= 0) {                    print((int) Math.pow(2, i));                } else {                    print(null);                }            }            System.out.println();        }    }    private static void print(Integer num) {        if (num == null) {            for (int i = 0; i < MAX_SPACING+1; i++) {                System.out.print(" ");            }        } else {            int numSize = getNumberOfDigits(num);            System.out.print(" " + num);            for (int i = 0; i < MAX_SPACING - numSize; i++) {                System.out.print(" ");            }        }    }    private static int getNumberOfDigits(double num) {        return (int) (Math.log10(num)) + 1;    }}

Output

                             1                                                       1   2   1                                               1   2   4   2   1                                       1   2   4   8   4   2   1                               1   2   4   8   16  8   4   2   1                       1   2   4   8   16  32  16  8   4   2   1               1   2   4   8   16  32  64  32  16  8   4   2   1       1   2   4   8   16  32  64  128 64  32  16  8   4   2   1  

Clearly thats perfect but if i turned that in i would get cut for cheating by my teacher lol

[Arphenyte]

 

Something like this?

 

/** * Created by Tyler on 2014/10/05. */public class Test {    private static final int POWER_COUNT = 8;    private static final int MAX_SPACING = getNumberOfDigits(Math.pow(2, POWER_COUNT));    public static void main(final String... args) {        for (int line = 0; line < POWER_COUNT; line++) {            for(int i = line - POWER_COUNT + 1; i < line; i++) {                if (i >= 0) {                    print((int) Math.pow(2, i));                } else {                    print(null);                }            }            print((int) Math.pow(2, line));            for(int i = line - 1; i > line - POWER_COUNT; i--) {                if (i >= 0) {                    print((int) Math.pow(2, i));                } else {                    print(null);                }            }            System.out.println();        }    }    private static void print(Integer num) {        if (num == null) {            for (int i = 0; i < MAX_SPACING+1; i++) {                System.out.print(" ");            }        } else {            int numSize = getNumberOfDigits(num);            System.out.print(" " + num);            for (int i = 0; i < MAX_SPACING - numSize; i++) {                System.out.print(" ");            }        }    }    private static int getNumberOfDigits(double num) {        return (int) (Math.log10(num)) + 1;    }}

Output

                             1                                                       1   2   1                                               1   2   4   2   1                                       1   2   4   8   4   2   1                               1   2   4   8   16  8   4   2   1                       1   2   4   8   16  32  16  8   4   2   1               1   2   4   8   16  32  64  32  16  8   4   2   1       1   2   4   8   16  32  64  128 64  32  16  8   4   2   1  

Clearly thats perfect but if i turned that in i would get cut for cheating by my teacher lol

 

Asking for help is not cheating lol, as long as you understood what happened.

[Ciccioo]

the whitespace can be simply handled with tabs

import java.io.*;class pyramid{	private static final int ROWS = 8;	private static int power(int number, int exp){			int res = 1;			while(exp-- > 0)					res *= number;			return res;	}	public static void main(String[] args){			for(int i = 1; i <= ROWS; i++){					int j, blanks = ROWS - i;					for(j = 0; j < blanks; j++)							System.out.print("\t");					int max = power(2, i - 1);					for(j = 1; j <= max; j *= 2)							System.out.print(j + "\t");					for(j = j / 4; j > 0; j /= 2)							System.out.print(j + "\t");					System.out.println();			}	}}