如何在Java中打印三角形?
我是Java的初学者。我用Deitel和Deitel学习Java,练习中的一个问题要求你打印三角形。问题是:
(Triangle Printing Program) Write an application that displays the following patterns separately, one below the other. Use for loops to generate the patterns. All asterisks (*) should be printed by a single statement of the form
System.out.print( '*' );
which causes the asterisks to print side by side. A statement of the formSystem.out.println();
can be used to move to the next line. A statement of the form System.out.print( ' ' );` can be used to display a space for the last two patterns. There should be no other output statements in the program.(a) (b) (c) (d) * ********** ********** * ** ********* ********* ** *** ******** ******** *** **** ******* ******* **** ***** ****** ****** ***** ****** ***** ***** ****** ******* **** **** ******* ******** *** *** ******** ********* ** ** ********* ********** * * **********
我得到了a,但我需要一些b、c和d方面的帮助。提前谢谢!:)
另外,这是我的a代码:
public class p5_15
{
public static void main( String[] args )
{
int line;
int star;
for( line = 1; line <= 10; line++ )
{
for( star = 1; star <= line; star++ )
{
System.out.print( "*" );
}
System.out.println();
}
}
}
# 1 楼答案
您需要使用嵌套在另一个for循环中的for循环。语法如下所示:
根据要绘制的三角形,需要使用
...
替换的表达式以及第二个for循环的初始化和条件例如,在(c)中,在第一行(i=0)上,您希望j从0开始并递增到9(即您打印的星星数-1)。然后下一行(i=1),你希望j从0开始,递增到8。你应该已经注意到了一种模式