java语言编写99乘法表的变形

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首先我们输出一个一般的9*9乘法表

代码如下：

public class Triangle {
public static void main(String[] args) {

/* 正位三角形 */

int sum = 0;
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <= i; j++) {
sum = i * j;
if (sum < 10) {
System.out.print(j + "*" + i + "=" + " " + sum + " ");
} else {
System.out.print(j + "*" + i + "=" + sum + " ");
}

}
System.out.println();
}

然后我们将这个三角形进行上下变换（个人将其简称为反位三角形）

代码如下：

int sum = 0;
for (int i = 9; i > 0; i--) {
for (int j = i; j > 0; j--) {
sum = i * j;
if (sum < 10) {
System.out.print(j + "*" + i + "=" + " " + sum + " ");
} else {
System.out.print(j + "*" + i + "=" + sum + " ");
}
}
System.out.println();
}

现在我们将正位三角形进行左右变换

代码如下：

/* 正位对角三角形 */（即右上方）

int sum = 0;
for (int i = 9; i > 0; i--) {
for (int z = 0; z <= 9 - i; z++) {
System.out.print(" ");
}
for (int j = 1; j <= i; j++) {
sum = i * j;
if (sum < 10) {
System.out.print(j + "*" + i + "=" + " " + sum + " ");
} else {
System.out.print(j + "*" + i + "=" + sum + " ");
}
}
System.out.println();
}

代码如下：

int sum = 0;（即右下方）
for (int i = 1; i < 10; i++) {
for (int z = 9 - i; z >= 0; z--) {
System.out.print(" ");
}
for (int j = 1; j <= i; j++) {
sum = i * j;
if (sum < 10) {
System.out.print(j + "*" + i + "=" + " " + sum + " ");
} else {
System.out.print(j + "*" + i + "=" + sum + " ");
}
}
System.out.println();
}

最后我们将这四个三角形进行简单的一些变化组合，可以生成一个四个三角形组成的矩形

代码如下：

int sum = 0;
for (int i = 9; i > 0; i--) {//此部分用于生成上面的两个三角形
for (int j = i; j > 0; j--) {//上部分左边三角形
sum = i * j;
if (sum < 10) {
System.out.print(i + "*" + j + "=" + " " + sum + " ");
} else {
System.out.print(i + "*" + j + "=" + sum + " ");
}
}
for (int z = 0; z < 9 - i; z++) {//中间的空格
System.out.print(" ");
System.out.print(" ");
}

for (int m = 1; m <= i; m++) { //上部分右边三角形
sum = i * m;
if (sum < 10) {
System.out.print(m + "*" + i + "=" + " " + sum + " ");
} else {
System.out.print(m + "*" + i + "=" + sum + " ");
}
}
System.out.println();
}

for (int i = 1; i <= 9; i++) { //此部分用于生成下面的两个三角形
for (int j = i; j >= 1; j--) {//下部分左边三角形
sum = i * j;
if (sum < 10) {
System.out.print(j + "*" + i + "=" + " " + sum + " ");
} else {
System.out.print(j + "*" + i + "=" + sum + " ");
}
}
for (int z = 9 - i; z > 0; z--) {/中间空格部分/
System.out.print(" ");
}
for (int z = 9 - i; z > 0; z--) {
System.out.print(" ");
}
for (int j = 1; j <= i; j++) {//下部分右边三角形
sum = i * j;
if (sum < 10) {
System.out.print(j + "*" + i + "=" + " " + sum + " ");
} else {
System.out.print(j + "*" + i + "=" + sum + " ");
}
}
System.out.println();
}

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