triangleMadness

#include <iostream>

const int maxCord{9};
int a,b,c,d;
char input{'x'};

int main ()
{
    do
    {
        std::cout<<"Enter figure a, b, c, d, e, f, g, h, i, j or x to exit\n";
        std::cin>>input;
        if (input == 'a') {a=-1; b=1; c=1; d=1;}
        else if (input == 'b') {a=-1; b=-1; c=1; d=-1;}
        else if (input == 'c') {a=-1; b=1; c=-1; d=1;}
        else if (input == 'd') {a=1; b=-1; c=1; d=-1;}
        else if (input == 'e') {a=-1; b=1; c=1; d=-1;}
        else if (input == 'f') {a=-1; b=-1; c=1; d=1;}
        else if (input == 'g') {a=-1; b=-1; c=-1; d=-1;}
        else if (input == 'h') {a=1; b=1; c=1; d=1;}
        else if (input == 'i') {a=-1; b=-1; c=-1; d=1;}
        else if (input == 'j') {a=1; b=-1; c=1; d=1;}
        else if (input == 'x') {break;}
        else {std::cout<<"Incorrect input\n"; continue; };

        for (int y=0; y < maxCord; ++y)
        {
            for (int x = 0; x < maxCord; ++x)
            {
                //((x+y) >= (maxCord-1) and x >= y) or ((x+y) >= (maxCord-1) and x >= y)
                std::cout<<' '<< ( ( (a*(x+y) >= a*(maxCord-1) and b*x >= b*y) or (c*(x+y) >= c*(maxCord-1) and d*x >= d*y) ) ? '*' : ' ') <<' ';
            }
            std::cout << '\n';
        }
        std::cout << '\n';
    } while (input!='x');
}