triangle patterns using numbers in C

Pattern 1: Right-Aligned Number Triangle

    1
   12
  123
 1234
12345

Code:

#include <stdio.h>

int main() {
    int rows = 5;

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

    return 0;
}

---

Pattern 2: Full Pyramid of Numbers

    1
   123
  12345
 1234567
123456789

Code:

#include <stdio.h>

int main() {
    int rows = 5;

    for (int i = 1; i <= rows; i++) {
        // Print spaces
        for (int j = 1; j <= rows - i; j++) {
            printf(" ");
        }
        // Print numbers
        for (int j = 1; j <= 2 * i - 1; j++) {
            printf("%d", j);
        }
        printf("\n");
    }

    return 0;
}

---

Pattern 3: Inverted Pyramid of Numbers

123456789
 1234567
  12345
   123
    1

Code:

#include <stdio.h>

int main() {
    int rows = 5;

    for (int i = rows; i >= 1; i--) {
        // Print spaces
        for (int j = 1; j <= rows - i; j++) {
            printf(" ");
        }
        // Print numbers
        for (int j = 1; j <= 2 * i - 1; j++) {
            printf("%d", j);
        }
        printf("\n");
    }

    return 0;
}

---

How It Works:

1. Spaces: Use an inner loop to print spaces to align the numbers properly.
2. Numbers: Another inner loop prints numbers in a sequence for each row.
3. Outer Loop: Determines the number of rows.