C Exercises: Display Pascal's triangle

C For Loop: Exercise-33 with Solution

Write a C program to display Pascal's triangle.

Construction of Pascal's Triangle:

As shown in Pascal's triangle, each element is equal to the sum of the two numbers immediately above it.

Sample Solution:

C Code:

#include <stdio.h> // Include the standard input/output header file.

int main() {
    int no_row, c = 1, blk, i, j; // Declare variables for row count, pattern counter, and loop control.

    // Prompt the user to input the number of rows.
    printf("Input number of rows: ");
    scanf("%d", &no_row); // Read the input from the user.

    // Outer loop for iterating over rows.
    for (i = 0; i < no_row; i++) {
        // Inner loop for printing spaces.
        for (blk = 1; blk <= no_row - i; blk++)
            printf("  ");

        // Inner loop for generating and printing pattern.
        for (j = 0; j <= i; j++) {
            if (j == 0 || i == 0) // If it's the first column or first row, set c to 1.
                c = 1;
            else
                c = c * (i - j + 1) / j; // Calculate the next pattern value.
            printf("% 4d", c); // Print the pattern value.
        }

        printf("\n"); // Move to the next row.
    }

    return 0; // Return 0 to indicate successful execution.
}

Sample Output:

Input number of rows: 5                                                                                       
             1                                                                                                
           1   1                                                                                              
         1   2   1                                                                                            
       1   3   3   1                                                                                          
     1   4   6   4   1 

Flowchart:

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