Print an Inverted Half Pyramid Number Pattern in C

To print an inverted half-pyramid number pattern in C, we use nested loops where the outer loop controls the rows, and the inner loop prints numbers in descending order, reducing the count in each iteration.

Examples of Inverted Half Pyramid Number Pattern

1. Basic Inverted Half Pyramid with Numbers

In this example, we will print an inverted half pyramid with numbers starting from 1 at the first column, decreasing in length each row.

main.c

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#include <stdio.h>

int main() {
    int rows = 5;

    for (int i = rows; i >= 1; i--) {
        for (int j = 1; j <= i; j++) {
            printf("%d ", j);
        }
        printf("\n");
    }

    return 0;
}

Explanation:

  1. We declare an integer variable rows and assign it the value of 5 (number of rows in the pyramid).
  2. The outer for loop runs from rows down to 1, controlling the number of rows.
  3. The inner for loop prints numbers from 1 to i, reducing i in each row.
  4. After printing the numbers for each row, printf("\n") moves the cursor to the next line.

Output:

1 2 3 4 5 
1 2 3 4 
1 2 3 
1 2 
1

2. Inverted Half Pyramid with Row Numbers

In this example, we will print an inverted half pyramid where each row contains its row number instead of a sequence of numbers.

main.c

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#include <stdio.h>

int main() {
    int rows = 5;

    for (int i = rows; i >= 1; i--) {
        for (int j = 1; j <= i; j++) {
            printf("%d ", i);
        }
        printf("\n");
    }

    return 0;
}

Explanation:

  1. The rows variable is initialized to 5 to define the number of rows.
  2. The outer for loop runs from rows to 1.
  3. The inner for loop prints the row number (i) instead of a sequence of numbers.
  4. The printf("\n") statement moves to the next row.

Output:

5 5 5 5 5 
4 4 4 4 
3 3 3 
2 2 
1

3. Inverted Half Pyramid with Reverse Numbers

In this example, we will print an inverted half pyramid where each row contains numbers in descending order.

main.c

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#include <stdio.h>

int main() {
    int rows = 5;

    for (int i = rows; i >= 1; i--) {
        for (int j = i; j >= 1; j--) {
            printf("%d ", j);
        }
        printf("\n");
    }

    return 0;
}

Explanation:

  1. The rows variable is set to 5 to determine the number of rows.
  2. The outer loop starts from rows and decrements to 1.
  3. The inner loop prints numbers in descending order from i down to 1.
  4. The printf("\n") ensures a new line after each row.

Output:

5 4 3 2 1 
4 3 2 1 
3 2 1 
2 1 
1

Conclusion

In this tutorial, we learned different ways to print an inverted half-pyramid number pattern in C:

  1. Printing a basic inverted number pyramid.
  2. Using row numbers instead of sequential numbers.
  3. Printing the pyramid with numbers in reverse order.