﻿ C++ Exercises: Display Pascal's triangle like pyramid - w3resource

# C++ Exercises: Display Pascal's triangle like pyramid

## C++ For Loop: Exercise-45 with Solution

Write a C++ program to display Pascal's triangle like a pyramid.

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 <iostream> // Include the input/output stream library
using namespace std; // Using standard namespace

int main() // Main function where the execution of the program starts
{
int row, c = 1, blk, i, j; // Declare integer variables row, c, blk, i, and j

// Display message asking for input
cout << "\n\n Display the Pascal's triangle:\n";
cout << "-----------------------------------\n";
cout << " Input number of rows: ";
cin >> row; // Read input for the number of rows from the user

for (i = 0; i < row; i++) // Loop for the number of rows
{
for (blk = 1; blk <= row - i; blk++) // Loop to print spaces before the numbers
cout << "  "; // Print two spaces for formatting

for (j = 0; j <= i; j++) // Loop to calculate and print the numbers in each row
{
if (j == 0 || i == 0) // Check if it's the first column or the first row
c = 1; // Assign 1 to 'c' if it's the first column or the first row
else
c = c * (i - j + 1) / j; // Calculate the next number using the previous value

cout << c << "   "; // Print the calculated number followed by spaces for formatting
}

cout << endl; // Move to the next line after each row is printed
}
}
``````

Sample Output:

``` Display the Pascal's triangle:
-----------------------------------
Input number of rows: 5
1
1   1
1   2   1
1   3   3   1
1   4   6   4   1
```

Flowchart:

C++ Code Editor: