I've been programing in C++ lately. I am going to be a game programmer, and there's no use waiting.

Anyway, the program I just programed can do (currently) three types of geometry: the circumference of a circle, the area of a square, and the area of a triangle. It also has color, but if you have a C++ compiler and paste the below code into it, it won't work.

This is why: the #include "msoft.h" is a header that was created, meaning it's not stored in the compiler's "list" of headers it can understand. Here's how to run the program with color:

(This is for Microsoft Visual C++ 6.0)

1. Create a new workspace by clicking "File" on the menu.

2. Click new.

3. Select Win32 Console Application and type in a progect name. Click new.

4. Choose "An empty project" and click finish. Click OK. 

5. Go to "File" and click on new again.

6. Choose C/C++ Header File. Type in a file name and click OK.

7. Copy (Ctrl + C) the "msoftcon.h" code from below and paste (Ctrl + V) in in the text area.

8. Go to "File" and click on new AGAIN.

9. Choose C++ Source File. Type the file name and click OK.

10. Copy the "msoftcon.cpp" code from below and paste it in the text area.

11. Repeat steps 8 and 9.

12. Copy the "program.cpp" code from below and paste it in the text area.

OK, now click the red exclamation mark under the "Build" menu to execute the program.

Click yes.

msofcon.h:

//msoftcon.h
//declarations for Lafore's console graphics functions
//uses Window's console functions

#ifndef _INC_WCONSOLE    //don't let this file be included
#define _INC_WCONSOLE    //twice in the same source file

#include      //for Windows console functions
#include        //for kbhit(), getche()
#include         //for sin, cos

enum fstyle { SOLID_FILL, X_FILL,      O_FILL,
              LIGHT_FILL, MEDIUM_FILL, DARK_FILL };

enum color {
   cBLACK=0,     cDARK_BLUE=1,    cDARK_GREEN=2, cDARK_CYAN=3,
   cDARK_RED=4,  cDARK_MAGENTA=5, cBROWN=6,      cLIGHT_GRAY=7,
   cDARK_GRAY=8, cBLUE=9,         cGREEN=10,     cCYAN=11,
   cRED=12,      cMAGENTA=13,     cYELLOW=14,    cWHITE=15 };
//--------------------------------------------------------------
void init_graphics();
void set_color(color fg, color bg = cBLACK);
void set_cursor_pos(int x, int y);
void clear_screen();
void wait(int milliseconds);
void clear_line();
void draw_rectangle(int left, int top, int right, int bottom);                   
void draw_circle(int x, int y, int rad);
void draw_line(int x1, int y1, int x2, int y2);
void draw_pyramid(int x1, int y1, int height);
void set_fill_style(fstyle);
#endif /* _INC_WCONSOLE */

mosoftcon.cpp:

//msoftcon.cpp
//provides routines to access Windows console functions

//compiler needs to be able to find this file
//in MCV++, /Tools/Options/Directories/Include/type path name

#include "msoftcon.h"
HANDLE hConsole;         //console handle
char fill_char;          //character used for fill
//--------------------------------------------------------------
void init_graphics()
   {
   COORD console_size = {80, 25};
   //open i/o channel to console screen
   hConsole = CreateFile("CONOUT$", GENERIC_WRITE | GENERIC_READ,
                   FILE_SHARE_READ | FILE_SHARE_WRITE,
                   0L, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0L);
   //set to 80x25 screen size
   SetConsoleScreenBufferSize(hConsole, console_size);
   //set text to white on black
   SetConsoleTextAttribute( hConsole, (WORD)((0 << 4) | 15) );

   fill_char = '\xDB';  //default fill is solid block
   clear_screen();
   }
//--------------------------------------------------------------
void set_color(color foreground, color background)
   {
   SetConsoleTextAttribute( hConsole,
                        (WORD)((background << 4) | foreground) );
   }  //end setcolor()

/* 0  Black          8  Dark gray
   1  Dark blue      9  Blue
   2  Dark green     10 Green
   3  Dark cyan      11 Cyan
   4  Dark red       12 Red
   5  Dark magenta   13 Magenta
   6  Brown          14 Yellow
   7  Light gray     15 White
*/
//--------------------------------------------------------------
void set_cursor_pos(int x, int y)
   {
   COORD cursor_pos;              //origin in upper left corner
   cursor_pos.X = x - 1;          //Windows starts at (0, 0)
   cursor_pos.Y = y - 1;          //we start at (1, 1)
   SetConsoleCursorPosition(hConsole, cursor_pos);
   }
//--------------------------------------------------------------
void clear_screen()
   {
   set_cursor_pos(1, 25);
   for(int j=0; j<25; j++)
      putch('\n');
   set_cursor_pos(1, 1);
   }
//--------------------------------------------------------------
void wait(int milliseconds)
   {
   Sleep(milliseconds);
   }
//--------------------------------------------------------------
void clear_line()                    //clear to end of line
   {                                 //80 spaces
   //.....1234567890123456789012345678901234567890
   //.....0........1.........2.........3.........4
   cputs("                                        ");
   cputs("                                        ");
   }
//--------------------------------------------------------------
void draw_rectangle(int left, int top, int right, int bottom)
   {
   char temp[80];
   int width = right - left + 1;

   for(int j=0; j      temp[j] = fill_char;  
   temp[j] = 0;                    //null

   for(int y=top; y<=bottom; y++)  //stack of strings
      {
      set_cursor_pos(left, y);
      cputs(temp);
      }
   }
//--------------------------------------------------------------
void draw_circle(int xC, int yC, int radius)
   {
   double theta, increment, xF, pi=3.14159;
   int x, xN, yN;

   increment = 0.8 / static_cast(radius);
   for(theta=0; theta<=pi/2; theta+=increment)  //quarter circle
      {
      xF = radius * cos(theta); 
      xN = static_cast(xF * 2 / 1); //pixels not square
      yN = static_cast(radius * sin(theta) + 0.5);
      x = xC-xN;
      while(x <= xC+xN)          //fill two horizontal lines
         {                       //one for each half circle
         set_cursor_pos(x,   yC-yN); putch(fill_char);  //top
         set_cursor_pos(x++, yC+yN); putch(fill_char);  //bottom
         }
      }  //end for
   }
//--------------------------------------------------------------
void draw_line(int x1, int y1, int x2, int y2)
   {

   int w, z, t, w1, w2, z1, z2;
   double xDelta=x1-x2, yDelta=y1-y2, slope;
   bool isMoreHoriz;

   if( fabs(xDelta) > fabs(yDelta) ) //more horizontal
      {
      isMoreHoriz = true;
      slope = yDelta / xDelta;
      w1=x1; z1=y1; w2=x2, z2=y2;    //w=x, z=y
      }
   else                              //more vertical
      {
      isMoreHoriz = false;
      slope = xDelta / yDelta;
      w1=y1; z1=x1; w2=y2, z2=x2;    //w=y, z=x
      }

   if(w1 > w2)                       //if backwards w
      {
      t=w1; w1=w2; w2=t;             //   swap (w1,z1)
      t=z1; z1=z2; z2=t;             //   with (w2,z2)
      }
   for(w=w1; w<=w2; w++)           
      {
      z = static_cast(z1 + slope * (w-w1));
      if( !(w==80 && z==25) )        //avoid scroll at 80,25
         {
         if(isMoreHoriz)
            set_cursor_pos(w, z);
         else
            set_cursor_pos(z, w);
         putch(fill_char);
         }
      }
   }
//--------------------------------------------------------------
void draw_pyramid(int x1, int y1, int height)
   {
   int x, y;
   for(y=y1; y      {
      int incr = y - y1;
      for(x=x1-incr; x<=x1+incr; x++)
         {
         set_cursor_pos(x, y);
         putch(fill_char);
         }
      }
   }
//--------------------------------------------------------------
void set_fill_style(fstyle fs)
   {
   switch(fs)
      {
      case SOLID_FILL:  fill_char = '\xDB'; break;
      case DARK_FILL:   fill_char = '\xB0'; break;
      case MEDIUM_FILL: fill_char = '\xB1'; break;
      case LIGHT_FILL:  fill_char = '\xB2'; break;
      case X_FILL:      fill_char = 'X';    break;
      case O_FILL:      fill_char = 'O';    break;
      }
   }
//--------------------------------------------------------------

program.cpp:

#include
#include "msoftcon.h"

int main()
{

start:

 int where;
 
 init_graphics();
 
 cout <<"\n\n1---Circumfrence of a circle";
 cout <<"\n2---Area of a square";
 cout <<"\n3---Area of a triangle";
 cout <<"\n\nWhat type of goemetric math do you want to do? ";
 set_color(cGREEN);
 cin >> where;

 switch(where)
 {
 case 1:
  goto circum;
  break;
 case 2:
  goto areasquare;
  break;
 case 3:
  goto areatrin;
  break;
 }

circum:

 float radius, circum;
 int yn;

 init_graphics();
 
 cout <<"\n\n\nPlease enter the radius of the circle: ";
 set_color(cYELLOW);
 cin >> radius;

 init_graphics();

 circum = (2 * 3.1416 * radius);
 cout <<"\n\nThe circumfrence of the circle is " << circum << ".\n\n";
 set_color(cRED);

 init_graphics();
 
 cout <<"Do you want to restart the program? \n(1 for yes or 0 for no) ";
 set_color(cBLUE);
 cin >> yn;
 switch (yn)
 {
 case 1:
  goto start;
  break;
 }
 
areasquare:
 
 float leangth, width, area;

 init_graphics();
 
 cout <<"\n\n\nPlease enter the length and the the width of the rectangle: ";
 set_color(cRED);
 cin >> leangth >> width;

 init_graphics();
 
 area = (leangth * width);
 cout <<"\nThe area of the square is "<< area <<".\n\n";
 set_color(cWHITE);

 init_graphics();
 
 cout <<"Do you want to restart the program? \n(1 for yes or 0 for no) ";
 set_color(cYELLOW);
 cin >> yn;
 switch (yn)
 {
 case 1:
  goto start;
  break;
 }

areatrin:

 float base, height, triarea;

 init_graphics();
 
 cout <<"\nPlease enter the length of the base and the height: ";
 set_color(cGREEN);
 cin >> base >> height;

 init_graphics();
 
 triarea = (base * height / 2);
 set_color(cBLUE);
 cout <<"The area of the triangle is "<< area <<".\n\n";
 
 init_graphics();
 
 cout <<"Do you want to restart the program? \n(1 for yes or 0 for no) ";
 set_color(cRED);
 cin >> yn;
 switch (yn)
 {
 case 1:
  goto start;
  break;
 }
 
 return 0;
}

It should work!