Question

java 金字塔 如何编写下面金字塔： 1 212 32123 4321234 543212345 65432123456 765432123456

Answer 1

显示数 －行数 ＝ 递增数
1 －1 ＝ 0
3 －2 ＝1
5 －3 ＝2
7 －4 ＝3
9 －5 ＝4

for(int i=1;i<=9;i=2*i-1){
int start = (i+1)/2;
for(int j=start;j>=1;j--){
print j;
}
for(j=2;j<=start;j++){
print j;
}
}

Answer 2

public static void main(String[] args) {
for (int i = 1; i <=7; i++) {
for (int j = 7; j >i; j--) {
System.out.print(" ");

}
for (int j = i; j >=1; j--) {
System.out.print(j);

}
for (int j = 2; j <=i; j++) {
System.out.print(j);

}
System.out.println();

}

}

Answer 3

public class Test {
public static void main(String[] args) {
int k = 10;
for (int i = 0; i < k; i++) {
for (int j = 0; j < k * 2 - 1; j++) {
if(j>=k-i-1&&j<=k+i-1)
System.out.print(Math.abs(k - j - 1) + 1);
else
System.out.print(" ");
}
System.out.println("");
}
}
}

看看吧

追问

谢谢了。

Answer 4

public static void main(String[] args) {
for (int i = 1; i <=7; i++) {
for (int j = 7; j >i; j--) {
System.out.print(" ");

}
for (int j = i; j >=1; j--) {
System.out.print(j);

}
for (int j = 2; j <=i; j++) {
System.out.print(j);

}
System.out.println();

}

}