| List of Source Code |
|---|
| Code to print triangles using *, digits and characters |
| Code to print inverted triangles using * and digits |
| Code to print full pyramids |
| Code to print Pascal’s triangle |
| Code to print Floyd’s triangle |
程序使用*，数字和字符打印三角形
示例1：使用*打印半金字塔的程序
*
* *
* * *
* * * *
* * * * *源代码
public class Pattern {
public static void main(String[] args) {
int rows = 5;
for(int i = 1; i <= rows; ++i) {
for(int j = 1; j <= i; ++j) {
System.out.print("* ");
}
System.out.println();
}
}
}示例2：使用数字打印半金字塔a的程序
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5源代码
public class Pattern {
public static void main(String[] args) {
int rows = 5;
for(int i = 1; i <= rows; ++i) {
for(int j = 1; j <= i; ++j) {
System.out.print(j + " ");
}
System.out.println();
}
}
}
示例3：使用字母打印半金字塔的程序
A
B B
C C C
D D D D
E E E E E源代码
public class Pattern {
public static void main(String[] args) {
char last = 'E', alphabet = 'A';
for(int i = 1; i <= (last-'A'+1); ++i) {
for(int j = 1; j <= i; ++j) {
System.out.print(alphabet + " ");
}
++alphabet;
System.out.println();
}
}
}程序使用*和数字打印倒半金字塔
示例4：使用*倒置的半金字塔
* * * * *
* * * *
* * *
* *
*源代码
public class Pattern {
public static void main(String[] args) {
int rows = 5;
for(int i = rows; i >= 1; --i) {
for(int j = 1; j <= i; ++j) {
System.out.print("* ");
}
System.out.println();
}
}
}示例5：使用数字倒置的半金字塔
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1源代码
public class Pattern {
public static void main(String[] args) {
int rows = 5;
for(int i = rows; i >= 1; --i) {
for(int j = 1; j <= i; ++j) {
System.out.print(j + " ");
}
System.out.println();
}
}
}使用*和数字显示金字塔和倒金字塔的程序
示例6：使用*打印完整金字塔的程序
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *源代码
public class Pattern {
public static void main(String[] args) {
int rows = 5, k = 0;
for(int i = 1; i <= rows; ++i, k = 0) {
for(int space = 1; space <= rows - i; ++space) {
System.out.print(" ");
}
while(k != 2 * i - 1) {
System.out.print("* ");
++k;
}
System.out.println();
}
}
}
示例7：使用数字打印金字塔的程序
1
2 3 2
3 4 5 4 3
4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5源代码
public class Pattern {
public static void main(String[] args) {
int rows = 5, k = 0, count = 0, count1 = 0;
for(int i = 1; i <= rows; ++i) {
for(int space = 1; space <= rows - i; ++space) {
System.out.print(" ");
++count;
}
while(k != 2 * i - 1) {
if (count <= rows - 1) {
System.out.print((i + k) + " ");
++count;
}
else {
++count1;
System.out.print((i + k - 2 * count1) + " ");
}
++k;
}
count1 = count = k = 0;
System.out.println();
}
}
}
示例8：使用*倒置完整金字塔
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*源代码
public class Pattern {
public static void main(String[] args) {
int rows = 5;
for(int i = rows; i >= 1; --i) {
for(int space = 1; space <= rows - i; ++space) {
System.out.print(" ");
}
for(int j=i; j <= 2 * i - 1; ++j) {
System.out.print("* ");
}
for(int j = 0; j < i - 1; ++j) {
System.out.print("* ");
}
System.out.println();
}
}
}示例9：打印Pascal的三角形
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1源代码
public class Pattern {
public static void main(String[] args) {
int rows = 6, coef = 1;
for(int i = 0; i < rows; i++) {
for(int space = 1; space < rows - i; ++space) {
System.out.print(" ");
}
for(int j = 0; j <= i; j++) {
if (j == 0 || i == 0)
coef = 1;
else
coef = coef * (i - j + 1) / j;
System.out.printf("%4d", coef);
}
System.out.println();
}
}
}示例10：打印弗洛伊德三角形。
1
2 3
4 5 6
7 8 9 10源代码
public class Pattern {
public static void main(String[] args) {
int rows = 4, number = 1;
for(int i = 1; i <= rows; i++) {
for(int j = 1; j <= i; j++) {
System.out.print(number + " ");
++number;
}
System.out.println();
}
}
}