Pyramid of pin using Recursion
I want to print a pyramid of pins using recursion(no Loops). I got the code almost done, but my pyramid is upside down, and it is not formatted. How can I fix it.
Below is my source code:
public void pinPattern(int count) {
if(count == 1)
System.out.println("*");
else {
System.out.print("*");
pinPattern(count - 1);
}
}
public int numberOfPins(int n) {
if(n == 0)
return 0;
else {
pinPattern(n);
return n + numberOfPins(n - 1);
}
}
public static void main(String args) {
Recursion x = new Recursion();
System.out.println("The number of pin: " + x.numberOfPins(5));
}
Thanks in advance.
java
edited Nov 16 '18 at 0:32
KevinO
3,27642031
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
add a comment |
I want to print a pyramid of pins using recursion(no Loops). I got the code almost done, but my pyramid is upside down, and it is not formatted. How can I fix it.
Below is my source code:
public void pinPattern(int count) {
if(count == 1)
System.out.println("*");
else {
System.out.print("*");
pinPattern(count - 1);
}
}
public int numberOfPins(int n) {
if(n == 0)
return 0;
else {
pinPattern(n);
return n + numberOfPins(n - 1);
}
}
public static void main(String args) {
Recursion x = new Recursion();
System.out.println("The number of pin: " + x.numberOfPins(5));
}
Thanks in advance.
java
edited Nov 16 '18 at 0:32
KevinO
3,27642031
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
I added my current output as a png file. Hope that helps.
– Arif Shahriar
Nov 16 '18 at 0:30
add a comment |
I want to print a pyramid of pins using recursion(no Loops). I got the code almost done, but my pyramid is upside down, and it is not formatted. How can I fix it.
Below is my source code:
public void pinPattern(int count) {
if(count == 1)
System.out.println("*");
else {
System.out.print("*");
pinPattern(count - 1);
}
}
public int numberOfPins(int n) {
if(n == 0)
return 0;
else {
pinPattern(n);
return n + numberOfPins(n - 1);
}
}
public static void main(String args) {
Recursion x = new Recursion();
System.out.println("The number of pin: " + x.numberOfPins(5));
}
Thanks in advance.
java
edited Nov 16 '18 at 0:32
KevinO
3,27642031
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
I want to print a pyramid of pins using recursion(no Loops). I got the code almost done, but my pyramid is upside down, and it is not formatted. How can I fix it.
Below is my source code:
public void pinPattern(int count) {
if(count == 1)
System.out.println("*");
else {
System.out.print("*");
pinPattern(count - 1);
}
}
public int numberOfPins(int n) {
if(n == 0)
return 0;
else {
pinPattern(n);
return n + numberOfPins(n - 1);
}
}
public static void main(String args) {
Recursion x = new Recursion();
System.out.println("The number of pin: " + x.numberOfPins(5));
}
Thanks in advance.
java
java
edited Nov 16 '18 at 0:32
KevinO
3,27642031
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
edited Nov 16 '18 at 0:32
KevinO
3,27642031
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
edited Nov 16 '18 at 0:32
KevinO
3,27642031
edited Nov 16 '18 at 0:32
KevinO
3,27642031
edited Nov 16 '18 at 0:32
KevinO
3,27642031
3,27642031
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
asked Nov 16 '18 at 0:11
Arif ShahriarArif Shahriar
63
63
I added my current output as a png file. Hope that helps.
– Arif Shahriar
Nov 16 '18 at 0:30
add a comment |
I added my current output as a png file. Hope that helps.
– Arif Shahriar
Nov 16 '18 at 0:30
I added my current output as a png file. Hope that helps.
– Arif Shahriar
Nov 16 '18 at 0:30
I added my current output as a png file. Hope that helps.
– Arif Shahriar
Nov 16 '18 at 0:30
add a comment |
1 Answer
1
active
oldest
votes
So there are two considerations here. First, the need to have the pyramid go the other direction. If it is printing upside-down, then instead of counting down (which goes from max to min), invert the approach. Something like:
public static int pinPatternUp(int numPins, int maxPins)
{
if (numPins <= maxPins) {
// this will add spaces
spaces(maxPins - numPins);
pins(numPins);
return numPins + (pinPattern(numPins + 1, maxPins));
}
return 0;
}
The logic for the pins method (which in the OP's code was 'pinPattern) in the OP's approach is essentially fine for either direction. However, making this change (so that there is a space after each*`) will allow for a bit better formatting.
System.out.print("* ");
The second question is one of formatting. In this case, we can look at the pyramid as requiring N spaces before the first output. And with a bit of investigation, it appears that a given line will have the total number of rows - the current row in terms of spaces. Using recursion, it is possible to do something like:
public static void spaces(int num)
{
if (num == 0) {
return;
}
System.out.print(" ");
spaces(num - 1);
}
Note that one can now have an "up" or "down" facing pyramid depending upon whether the pinPattern is increasing or decreasing.
Note: due to some editing, the method names do not exactly align with the OP's.
public static void main(String args)
{
pinPatternUp(1, 5);
pinPatternDown(5, 5);
}
Output if run up and then down:
*
* *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* *
*
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
So there are two considerations here. First, the need to have the pyramid go the other direction. If it is printing upside-down, then instead of counting down (which goes from max to min), invert the approach. Something like:
public static int pinPatternUp(int numPins, int maxPins)
{
if (numPins <= maxPins) {
// this will add spaces
spaces(maxPins - numPins);
pins(numPins);
return numPins + (pinPattern(numPins + 1, maxPins));
}
return 0;
}
The logic for the pins method (which in the OP's code was 'pinPattern) in the OP's approach is essentially fine for either direction. However, making this change (so that there is a space after each*`) will allow for a bit better formatting.
System.out.print("* ");
The second question is one of formatting. In this case, we can look at the pyramid as requiring N spaces before the first output. And with a bit of investigation, it appears that a given line will have the total number of rows - the current row in terms of spaces. Using recursion, it is possible to do something like:
public static void spaces(int num)
{
if (num == 0) {
return;
}
System.out.print(" ");
spaces(num - 1);
}
Note that one can now have an "up" or "down" facing pyramid depending upon whether the pinPattern is increasing or decreasing.
Note: due to some editing, the method names do not exactly align with the OP's.
public static void main(String args)
{
pinPatternUp(1, 5);
pinPatternDown(5, 5);
}
Output if run up and then down:
*
* *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* *
*
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
add a comment |
So there are two considerations here. First, the need to have the pyramid go the other direction. If it is printing upside-down, then instead of counting down (which goes from max to min), invert the approach. Something like:
public static int pinPatternUp(int numPins, int maxPins)
{
if (numPins <= maxPins) {
// this will add spaces
spaces(maxPins - numPins);
pins(numPins);
return numPins + (pinPattern(numPins + 1, maxPins));
}
return 0;
}
The logic for the pins method (which in the OP's code was 'pinPattern) in the OP's approach is essentially fine for either direction. However, making this change (so that there is a space after each*`) will allow for a bit better formatting.
System.out.print("* ");
The second question is one of formatting. In this case, we can look at the pyramid as requiring N spaces before the first output. And with a bit of investigation, it appears that a given line will have the total number of rows - the current row in terms of spaces. Using recursion, it is possible to do something like:
public static void spaces(int num)
{
if (num == 0) {
return;
}
System.out.print(" ");
spaces(num - 1);
}
Note that one can now have an "up" or "down" facing pyramid depending upon whether the pinPattern is increasing or decreasing.
Note: due to some editing, the method names do not exactly align with the OP's.
public static void main(String args)
{
pinPatternUp(1, 5);
pinPatternDown(5, 5);
}
Output if run up and then down:
*
* *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* *
*
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
add a comment |
So there are two considerations here. First, the need to have the pyramid go the other direction. If it is printing upside-down, then instead of counting down (which goes from max to min), invert the approach. Something like:
public static int pinPatternUp(int numPins, int maxPins)
{
if (numPins <= maxPins) {
// this will add spaces
spaces(maxPins - numPins);
pins(numPins);
return numPins + (pinPattern(numPins + 1, maxPins));
}
return 0;
}
The logic for the pins method (which in the OP's code was 'pinPattern) in the OP's approach is essentially fine for either direction. However, making this change (so that there is a space after each*`) will allow for a bit better formatting.
System.out.print("* ");
The second question is one of formatting. In this case, we can look at the pyramid as requiring N spaces before the first output. And with a bit of investigation, it appears that a given line will have the total number of rows - the current row in terms of spaces. Using recursion, it is possible to do something like:
public static void spaces(int num)
{
if (num == 0) {
return;
}
System.out.print(" ");
spaces(num - 1);
}
Note that one can now have an "up" or "down" facing pyramid depending upon whether the pinPattern is increasing or decreasing.
Note: due to some editing, the method names do not exactly align with the OP's.
public static void main(String args)
{
pinPatternUp(1, 5);
pinPatternDown(5, 5);
}
Output if run up and then down:
*
* *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* *
*
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
So there are two considerations here. First, the need to have the pyramid go the other direction. If it is printing upside-down, then instead of counting down (which goes from max to min), invert the approach. Something like:
public static int pinPatternUp(int numPins, int maxPins)
{
if (numPins <= maxPins) {
// this will add spaces
spaces(maxPins - numPins);
pins(numPins);
return numPins + (pinPattern(numPins + 1, maxPins));
}
return 0;
}
The logic for the pins method (which in the OP's code was 'pinPattern) in the OP's approach is essentially fine for either direction. However, making this change (so that there is a space after each*`) will allow for a bit better formatting.
System.out.print("* ");
The second question is one of formatting. In this case, we can look at the pyramid as requiring N spaces before the first output. And with a bit of investigation, it appears that a given line will have the total number of rows - the current row in terms of spaces. Using recursion, it is possible to do something like:
public static void spaces(int num)
{
if (num == 0) {
return;
}
System.out.print(" ");
spaces(num - 1);
}
Note that one can now have an "up" or "down" facing pyramid depending upon whether the pinPattern is increasing or decreasing.
Note: due to some editing, the method names do not exactly align with the OP's.
public static void main(String args)
{
pinPatternUp(1, 5);
pinPatternDown(5, 5);
}
Output if run up and then down:
*
* *
* * *
* * * *
* * * * *
* * * * *
* * * *
* * *
* *
*
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
edited Nov 16 '18 at 1:02
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
answered Nov 16 '18 at 0:57
KevinOKevinO
3,27642031
3,27642031
add a comment |
add a comment |
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I added my current output as a png file. Hope that helps.
– Arif Shahriar
Nov 16 '18 at 0:30