Diamond and Triangle

I've written this program already, but was wondering how I would alter it to make a Triangle and Diamond shape that are't just half of the object?

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#include<iostream>

using namespace std;

void instructions();
int menu();
void draw_shape(int choice);
int get_size();
char get_char();
void draw_triangle(int size, char c);
void draw_diamond(int size, char c);
void draw_bottom(int size, char c);



int main()
{
    int choice;

    instructions();
    choice = menu();
    if(choice == 3)
    {
        cout << "You requested to quit, bye! \n";
        return 0;
    }

    draw_shape(choice);

    return 0;
}

void instructions()
{
    cout << endl;
    cout << "If you would like to build a traingle or diamond, enter 1 or 2. 1 for Triangle. 2 for Diamond. 3 to quit. ";
}

int menu()
{
    int choice;
    cout << endl << endl;
    cout << "Your choice is: ";
    cin >> choice;
    return choice;

}

void draw_shape(int choice)
{
    int size;
    char c;
    size = get_size();
    c = get_char();

    if (choice == 1)     //after recieving the choice, sends data to next function, either to build a triangle or diamond
    {
        draw_triangle(size, c);

    }
    else if (choice == 2)
    {
        draw_diamond(size, c);
    }
}

int get_size()
{
    int size;
    cout << "What would you like the size of the shape to be? ";
    cin >> size;
    return size;
}

char get_char()
{
    char c;
    cout << "What character would you like to use? ";
    cin >> c;
    return c;
}

void draw_diamond(int size, char c)
{
    draw_triangle(size, c);
    draw_bottom(size,c);
}


void draw_triangle(int size, char c)
{
    for(int a=1; a<=size; a++)
    {
        for(int b=1; b<=a; b++)
        {
            cout << c;
        }
        cout << endl;
    }
}

void draw_bottom(int size, char c)      // The code in a similar backwards state as the draw triangle or diamond, sonas to build the bottom half of the diamond
{
    for(int a = 1; a < size; a++)
    {
      for(int b = 1; b <= (size-a); b++)
    {
    cout << c;
    }
    cout << endl;
}
}
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