PascalTriangle, C++ (gcc)

PascalTriangle

//g++  7.4.0

//write and test a function that creates Pascal's Triangle in the square matrix passed to it;
//credit for factorial function and combination function codes goes to John R. Hubbard, University of Richmond
//Pascal Triangle function  and test driver codes are created by Rezaul Hoque on June 30,2021; contact: jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their  learning;

#include <iostream>
using namespace std;
int fact(int );
int comb(int, int);
void pascal(int [][5], int);
void pascal(int b[5][5], int n){
for(int i=0;i<n;i++){
for(int j=0;j<i+1;j++)
b[i][j]=comb(i,j);
}
for(int i=0;i<n;i++){
for(int j=0;j<n;j++)
cout<<" "<<b[i][j];
cout<<endl;
  }
}
int fact(int n){
if (n<0) return 0;
int f= 1;
while(n>1)
f *= n--;
return f;
}
int comb(int n, int k){
return(fact(n)/(fact(k)*fact(n-k)));
}

int main(){
int n=5;
int b[5][5]={{0,0,0,0,0},{0,0,0,0,0},{0,0,0,0,0},{0,0,0,0,0},{0,0,0,0,0}};
pascal(b,n);
return 0;
}


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