C PROGRAMMING PROGRAM • PATTERN PROGRAMS

Print Pascal's Triangle

Learn how to print pascal's triangle using a clear C program.

AdvancedBinomial coefficientsNested loopsRecurrence

PROBLEM UNDERSTANDING

Input and expected output

Sample input

Sample output

COMPLETE C PROGRAM

Complete C implementation

#include <stdio.h>

int main(void)
{
    int rows;

    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (int row = 0; row < rows; row++) {
        unsigned long long value = 1;
        for (int space = 0; space < rows - row - 1; space++) printf(" ");
        for (int column = 0; column <= row; column++) {
            printf("%llu ", value);
            value = value * (unsigned long long) (row - column) / (unsigned long long) (column + 1);
        }
        printf("\n");
    }
    return 0;
}

CURRENT STEP

Select Start to walk through the important lines.

SELECTED LINE

No line selected

EXPECTED OUTPUT FOR THE SAMPLE

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
Generate every binomial coefficient from the previous coefficient in the same row.
Display the computed result.

Generate every binomial coefficient from the previous coefficient in the same row.

EFFICIENCY

Time and space complexity

Time complexity

O(n²)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

Check this

Use the correct format specifier for every variable.

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Initialize variables before using their values.

Check this

Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.