A pattern in C++

#include <iostream>
using namespace std;
int main()
{
    int n=7,m,a,s;
    while(n>0)
    {
        a=7-n;
        s=2*a;
        m=n;
        while(m>0)
        {
            cout<<" ";
            m=m-1;
        }
        cout<<"+";
        if(s>0)
        {
            while(s>1)
            {
                cout<<" ";
                s=s-1;
            }
            cout<<"+";
        }
        cout<<endl;
        n=n-1;
    }
    n=1;
        while(n<7)
    {
        n=n+1;
        a=7-n;
        s=2*a;
        m=n;
        while(m>0)
        {
            cout<<" ";
            m=m-1;
        }
        cout<<"+";
        if(s>0)
        {
            while(s>1)
            {
                cout<<" ";
                s=s-1;
            }
            cout<<"+";
        }
        cout<<endl;
    }
}