I want to create a program that draws a diamond or a triangle with a size that t

Question

I want to create a program that draws a diamond or a triangle with a size that the user selects using a specific character that will be entered at the keyboard. Here are two examples:
A triangle of size 4, using *:
*
***
*****
*******
A diamond of size 4, using *:
*
***
*****
*******
*****
***
*

Inputs:
1) a choice to draw one of the two shapes or to quit the program,
2) a character choice which will be used for drawing the selected shape, and
3) the size of the shape
Output:
One of these will be the output:
1) a triangle,
2) a diamond,
3) quit

Explanation / Answer

please rate - thanks

let me know if you haven't learned functions

#include<iostream>
using namespace std;
void drawtriangle(int);
void drawbottom(int);
int main()
{
int max,i,j;
int shape=0;
while(shape!=3)
{
cout<<"Enter shape to draw: ";
cout<<"1-triangle 2-diamond 3-quit ";
cin>>shape;
if(shape==3)
       return 0;
cout<<"Enter the size of the shape: ";
      cin>>max;

if(shape==1)
     drawtriangle(max);
else if(shape==2)
     {drawtriangle(max);
     drawbottom(max);
     }
else
     cout<<"invalid shape ";

   
}
}
void drawtriangle(int max)
{int i,j;
for(i=1;i<=max;i++)
    {for(j=0;j<i*2-1;j++)
          cout<<"*";
     cout<<endl;
     }
}
void drawbottom(int max)
{int i,j;
for(i=max;i>1;i--)
    {for(j=(i-1)*2-1;j>0;j--)
        cout<<"*";
    cout<<endl;
}
}

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