Question

编写一个程序，打印输出10行杨辉三角形。

用java编写，谢谢

Answer 1

public static void main(String[] args){
int[][] n = new int[10][21];
n[0][10] = 1;
for(int i=1;i<10;i++)
for(int j=10-i;j<10+i+1;j++)
n[i][j] = n[i-1][j-1]+n[i-1][j+1];
for(int i=0;i<10;i++){
for(int j=0;j<21;j++){
if(n[i][j]==0)
System.out.print(" ");
else{
if(n[i][j]<10)
System.out.print(" "+n[i][j]);//空格为了美观需要
else if(n[i][j]<100)
System.out.print(" "+n[i][j]);
else
System.out.print(n[i][j]);
}
}
System.out.println();
}
}

Answer 2

直接复制，绝对好用
public
class
Test
{
public
static
void
main(String[]
args)
{
int[][]
n
=
new
int[10][21];
n[0][10]
=
1;
for
(int
i
=
1;
i
<
10;
i++)
for
(int
j
=
10
-
i;
j
<
10
+
i
+
1;
j++)
n[i][j]
=
n[i
-
1][j
-
1]
+
n[i
-
1][j
+
1];
for
(int
i
=
0;
i
<
10;
i++)
{
for
(int
j
=
0;
j
<
21;
j++)
{
if
(n[i][j]
==
0)
System.out.print("
");
else
{
if
(n[i][j]
<
10)
System.out.print("
"
+
n[i][j]);
else
if
(n[i][j]
<
100)
System.out.print("
"
+
n[i][j]);
else
System.out.print(n[i][j]);
}
}
System.out.println();
}
}
}
结果
1
1
1
1
2
1
1
3
3
1
1
4
6
4
1
1
5
10
10
5
1
1
6
15
20
15
6
1
1
7
21
35
35
21
7
1
1
8
28
56
70
56
28
8
1
1
9
36
84
126
126
84
36
9
1
排版有点问题

Answer 3

直接复制，绝对好用
public class Test {
public static void main(String[] args) {
int[][] n = new int[10][21];
n[0][10] = 1;
for (int i = 1; i < 10; i++)
for (int j = 10 - i; j < 10 + i + 1; j++)
n[i][j] = n[i - 1][j - 1] + n[i - 1][j + 1];
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 21; j++) {
if (n[i][j] == 0)
System.out.print(" ");
else {
if (n[i][j] < 10)
System.out.print(" " + n[i][j]);
else if (n[i][j] < 100)
System.out.print(" " + n[i][j]);
else
System.out.print(n[i][j]);
}
}
System.out.println();
}
}
}

结果

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
1 7 21 35 35 21 7 1
1 8 28 56 70 56 28 8 1
1 9 36 84 126 126 84 36 9 1

排版有点问题