Code-with-love/cpp/southpole01_butterfly.cpp at master · Soham2020/Code-with-love · GitHub

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#include <iostream>
using namespace std;
int main()
{
    int i, j, n;
    cout<<"Enter a number n (like 3,4 etc) for the size of butterfly.";
    cin >> n;
    // upper half of the pattern
    for(i = 0; i < n; i++)
    {
        for(j = 0; j < (2 * n); j++)
        {
            if(j==n){
                if(i==0){
                    cout<<" ";
                }else{
                    cout<<"*";
                }
            }
            if(i >= j) // upper left triangle
                cout << "*";
            else
                cout << " ";
            if(i >= (2 * n - 1) - j)  // upper right triangle
                cout << "*";
            else
                cout << " ";
        }
        cout << "\n";
    }
    // bottom half of the pattern
    for(i = 0; i < n; i++)
    {
        for(j = 0; j < (2 * n); j++)
        {
            if(j==n){
                if(i==n-1){
                    cout<<" ";
                }else{
                    cout<<"*";
                }
            }
            if(i + j <= n - 1)  // bottom left triangle
                cout << "*";
            else
                cout << " ";
            if((i + n) <= j)  // bottom right triangle
                cout << "*";
            else
                cout << " ";
        }
        cout << "\n";
    }
    return 0;
}