问题:
I'm wondering if you could help me out. I'm trying to write a nested for loop in java that displays a number pyramid triangle that looks like
___________*#
__________*_*#...
可以将文章内容翻译成中文,广告屏蔽插件会导致该功能失效:
问题:
I'm wondering if you could help me out. I'm trying to write a nested for loop in java that displays a number pyramid triangle that looks like
___________*#
__________*_*#
_________*___*#
________*_____*#
_______*_______*#
______*_________*#
_____*___________*#
____*_____________*#
___*_______________*#
__*_________________*#
_*___________________*#
***********************#
This is what I have so far:
class Triagle {
public static void printTriagle(int n) {
for (int i = 0; i < n; i++) {
for (int j = n - i; j > 1; j--) {
System.out.print(" ");
}
for (int j = 0; j <= i; j++) {
// printing stars
System.out.print("* ");
}
System.out.println();
}
}
public static void main(String[] args) {
printTriagle(12);//I want to set the triangle to be height of 12
}
}
My result is not equal to the expected output:
___________*#
__________*_*#
_________*_*_*#
________*_*_*_*#
_______*_*_*_*_*#
______*_*_*_*_*_*#
_____*_*_*_*_*_*_*#
____*_*_*_*_*_*_*_*#
___*_*_*_*_*_*_*_*_*#
__*_*_*_*_*_*_*_*_*_*#
_*_*_*_*_*_*_*_*_*_*_*#
*_*_*_*_*_*_*_*_*_*_*_*#
回答1:
I have updated your code and added comments so that you can understand. Refer to the code below:
public static void printTriagle(int n) {
for (int i = 0; i < n; i++) {
for (int j = n - i; j > 1; j--) {
System.out.print("_");
}
String s = "_";
if (i + 1 >= n) // check if it is the last line
s = "*"; // change to print * instead of _
for (int j = 0; j <= i; j++) {
// printing stars
if (j == i)
System.out.print("*#"); // check if the last print of the line
else if (j == 0)
System.out.print("*" + s); // check if the first print of the line
else
System.out.print(s + s);
}
System.out.println();
}
}
Result:
___________*#
__________*_*#
_________*___*#
________*_____*#
_______*_______*#
______*_________*#
_____*___________*#
____*_____________*#
___*_______________*#
__*_________________*#
_*___________________*#
***********************#
回答2:
Try this
public static void printTriagle(int n) {
for (int i = 0; i < n; i++) {
for (int j = n - i; j > 1; j--) {
System.out.print(" ");
}
for (int j = 0; j <= i; j++) {
// printing stars
if(i == (n-1)){
System.out.print("**");
}
else{
System.out.print((j == 0 || j == i) ? "* " : " ");
}
}
System.out.println();
}
}
回答3:
Your issue is here:
for (int j=0; j<=i; j++){
// printing stars
System.out.print("* ");
}
Here, it prints a star for each number between 0 and i, but it only should print a star if it is exactly 0 or i.
Try something like this:
for (int j=0; j<=i; j++){
if ( i == n ) {
System.out.print("* ");
} else {
System.out.print(j == 0 || j == i ? "* " : " ");
}
}
EDIT: You may still have to adapt your code to get the bottom line printed correctly, in case that line has to be all stars
回答4:
This is what you need to do:
public static void printTriagle(int n) {
for(int i = 0; i < n; i++) {
for(int j = 0; j < 2*n; j++) {
if(i == n-1) {
System.out.print((j != 2*n-1) ? "*" : "#");
}
else {
if(i+j == n-1) {
if(i == 0) {
System.out.print("*#");
break;
}
else {
System.out.print("*");
}
}
else if(j-i == n-1) {
System.out.print("*#"); break;
}
else {
System.out.print("_");
}
}
}
System.out.println();
}