By | 25.12.2016

# Print Pascal Triangle using function

Write a C++ Program to Print Pascal Triangle using function. Here’s simple Program to Print Pascal Triangle using function in C++ Programming Language.

## Pascal’s Triangle

Pascal’s triangle is a triangular array of the binomial coefficients. Write a function that takes an integer value n as input and prints first n lines of the Pascal’s triangle. Following are the first 6 rows of Pascal’s Triangle.

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1

Here is source code of the C++ Program to Print Pascal Triangle using function. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

### SOURCE CODE : :

```/* C++ Program to Print Pascal Triangle using function  */

#include<iostream>

using namespace std;

//function to calculate factorial
long fact(int x)
{
int i;
long f=1;

for(i=1;i<=x;++i)
{
f=f*i;
}

return f;
}

int main()
{
int i,j,k,n;

cout<<"How many lines u want to Print :: ";
cin>>n;

for(i=0;i<n;++i)
{
//loop to print spaces at starting of each row
for(j=1;j<=(n-i-1);++j)
{
cout<<" ";
}

//loop to calculate each value in a row and print it
for(k=0;k<=i;++k)
{
cout<<fact(i)/(fact(i-k)*fact(k))<<" ";
}

cout<<"\n";    //print new line after each row
}

return 0;
}```

### OUTPUT : :

```/* C++ Program to Print Pascal Triangle using function */

How many lines u want to Print :: 10

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
1 7 21 35 35 21 7 1
1 8 28 56 70 56 28 8 1
1 9 36 84 126 126 84 36 9 1

Process returned 0```

Above is the source code for C++ Program to Print Pascal Triangle using function which is successfully compiled and run on Windows System.The Output of the program is shown above .

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