Example 1: Program to print half pyramid using *
* * * * * * * * * * * * * * *
Source code
public class Main { 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(); } } }
Example 2: Program to print half pyramid a using numbers
1 1 2 1 2 3 1 2 3 4 1 2 3 4 5
Source Code
public class Main { 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(); } } }
Example 3: Program to print half pyramid using alphabets
A B B C C C D D D D E E E E E
Source Code
public class Main { 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(); } } }
Programs to print inverted half pyramid using * and numbers
Example 4: Inverted half pyramid using *
* * * * * * * * * * * * * * *
Source Code
public class Main { 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(); } } }
Example 5: Inverted half pyramid using numbers
1 2 3 4 5 1 2 3 4 1 2 3 1 2 1
Source Code
public class Main { 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(); } } }
Programs to display pyramid and inverted pyramid using * and digits
Example 6: Program to print full pyramid using *
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
Source Code
public class Main { 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(); } } }
Example 7: Program to print pyramid using numbers
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
Source Code
public class Main { 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(); } } }
Example 8: Inverted full pyramid using *
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*
Source Code
public class Main { 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(); } } }
Example 9: Print Pascal’s triangle
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
Source Code
public class Main { 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(); } } }
Example 10: Print Floyd’s Triangle.
1 2 3 4 5 6 7 8 9 10
Source Code
public class Main { 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(); } } }
