C++ Program to Print Pascal Triangle

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This C++ Program which prints pascal’s triangle. The program takes number of rows as input and uses nested loops to print pascal’s triangle. The first inner loop creates the indentation space and the second inner loop computes the value of binomial coefficient, creates indentation space and prints the binomial coefficient for that particular column.

Here is source code of the C++ program which prints pascal’s triangle. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C++ Program to Print Pascal's Triangle
  3.  */
  4.  
  5. #include<iostream>
  6. using namespace std;
  7.  
  8. int main()
  9. {
  10.     int rows;
  11.     cout << "Enter the number of rows : ";
  12.     cin >> rows;
  13.     cout << endl;
  14.  
  15.     for (int i = 0; i < rows; i++)
  16.     {
  17.         int val = 1;
  18.         for (int j = 1; j < (rows - i); j++)
  19.         {
  20.             cout << "   ";
  21.         }
  22.         for (int k = 0; k <= i; k++)
  23.         {
  24.             cout << "      " << val;
  25.             val = val * (i - k) / (k + 1);
  26.         }
  27.         cout << endl << endl;
  28.     }
  29.     cout << endl;
  30.     return 0;
  31. }

$ g++ main.cpp
$ ./a.out
Enter the number of rows : 5
 
                  1
 
               1      1
 
            1      2      1
 
         1      3      3      1
 
      1      4      6      4      1

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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