GUI Calculator : Turbo C++

   The following program is a Calculator that can be used to perform all the basic arithmetical operations viz. addition, subtraction, multiplication and division. 

The calculator has a three dimensional shape, and so do all of its buttons. In other words, it looks like a real world, three-dimensional object rather than a two dimensional shape rendered in a program. It has been developed using the Turbo C++ 3.0 IDE. It uses BGI Graphics to render all the graphics. If you need to learn about BGI Graphics, read How to Create Graphical Applications using Turbo C++ 3.0 IDE (BGI graphics library) first. You can also learn Mouse Programming in Turbo C++ from here.

Screenshots

Source Code

/*------------------------------------------------------------------------- GUI Calculator Programmer : Manish Kumar Software Details ==================== Developed in : C++ Compiler used : TC++ 3.0 OS : Window 98,2000,XP, Vista,Windows7(only safemode) Licence : Protected (Please give the credit of programming to author.) -------------------------------------------------------------------------------------*/ #include <iostream.h> #include <conio.h> #include <graphics.h> #include <stdlib.h> #include <string.h> #include <dos.h> // Window #define TITLEBARHEIGHT 21 #define BORDERWIDTH 1 #define ADD 1 #define SUBTRACT 2 #define MULTIPLY 3 #define DIVIDE 4 /*--------------------- Global Data ---------------------*/ int ButtonId; enum bool{false,true}; enum BUTTON{MOUSE_NORMAL = 0,MOUSE_LBUTTON=1,MOUSE_RBUTTON=2,MOUSE_MBUTTON=4}; enum BUTTON_STATUS { BUTTON_STATUS_NORMAL, BUTTON_STATUS_DOWN }; /*------------------------------------------------------ Mouse Class ------------------------------------------------------*/ class Mouse { private: int MouseXpos, MouseYpos; BUTTON MouseBtn; union REGS in,out; public: int InstallMouse(); int ShowMouse(); int HideMouse(); void GetMouseStatus(); BUTTON GetButton(); int GetPosX(); int GetPosY(); void SetMousePosi(int &xpos, int &ypos); int MouseInside(int x1, int y1, int x2, int y2); void RestrictMousePtr(int x1, int y1, int x2, int y2); }; int Mouse::InstallMouse() { in.x.ax = 0; int86(51,&in,&out); return out.x.ax; } int Mouse::ShowMouse() { in.x.ax = 1; int86(51,&in,&out); return 1; } int Mouse::HideMouse() { in.x.ax = 2; int86(51,&in,&out); return 1; } void Mouse::GetMouseStatus() { in.x.ax = 3; int86(51,&in,&out); MouseXpos = out.x.cx; MouseYpos = out.x.dx; MouseBtn = out.x.bx; } BUTTON Mouse::GetButton() { return MouseBtn; } int Mouse::GetPosX() { return MouseXpos; } int Mouse::GetPosY() { return MouseYpos; } void Mouse::SetMousePosi(int &xpos, int &ypos) { in.x.ax = 4; in.x.cx = xpos; in.x.dx = ypos; int86(51,&in,&out); } int Mouse::MouseInside(int x1, int y1, int x2, int y2) { int x_pos, y_pos; in.x.ax = 3; int86(51,&in,&out); x_pos = out.x.cx; y_pos = out.x.dx; if(x_pos >= x1 && y_pos >= y1 && x_pos <= x2 && y_pos <= y2) return 1; else return 0; } void Mouse::RestrictMousePtr(int x1, int y1, int x2, int y2) { in.x.ax = 7; in.x.cx = x1; in.x.dx = x2; int86(51,&in,&out); in.x.ax = 8; in.x.cx = y1; in.x.dx = y2; int86(51,&in,&out); } /*------------------------------------------------------ End of Mouse Class ------------------------------------------------------*/ /*------------------------------------------------------ TextBox Class ------------------------------------------------------*/ class TextBox { private: int Alignment; int Left,Top,Width,Height; char Caption[50]; public: TextBox(int left, int top, int width, int height, char caption[],int Align); void Draw(); void SetText(char text[]); char *GetText(); void Clear(); }; TextBox::TextBox(int left, int top, int width, int height, char caption[],int Align) { Left = left; Top = top; Width = width; Height = height; strcpy(Caption,caption); Alignment = Align; } void TextBox::Draw() { setfillstyle(SOLID_FILL,WHITE); bar(Left,Top,Left+Width,Top+Height); setcolor(DARKGRAY); rectangle(Left,Top,Left+Width,Top+Height); setcolor(BLACK); settextjustify(Alignment,TOP_TEXT); if(Alignment==LEFT_TEXT) outtextxy(Left+2,Top+1+((Height/2)-(textheight(Caption)/2)),Caption); else if(Alignment==RIGHT_TEXT) outtextxy(Left+Width-2,Top+1+((Height/2)-(textheight(Caption)/2)),Caption); else outtextxy(Left+(Width/2),Top+1+((Height/2)-(textheight(Caption)/2)),Caption); } void TextBox::SetText(char text[]) { if (Left + textwidth(Caption) <= Left + Width - textwidth(" ")) { strcat(Caption,text); Draw(); } } char *TextBox::GetText() { return Caption; } void TextBox::Clear() { strcpy(Caption,""); Draw(); } /*------------------------------------------------------ End of TextBox Class ------------------------------------------------------*/ /*-------------------Mouse Object---------------------*/ static Mouse mouse; /*------------------------------------------------------ Button Class ------------------------------------------------------*/ class Button { private: int Left,Top,Width,Height,ID; char Caption[50]; BUTTON_STATUS btnStatus; void MouseDown(); void MouseUp(); bool State; public: Button(int left, int top, int width, int height, char caption[], int Id); void Draw(); void EnableClickHandler(); }; Button::Button(int left, int top, int width, int height, char caption[], int Id) { Left = left; Top = top; Width = width; Height = height; strcpy(Caption,caption); ID = Id; btnStatus = BUTTON_STATUS_NORMAL; State = false; } void Button::Draw() { setfillstyle(SOLID_FILL,LIGHTGRAY); bar(Left,Top,Left+Width,Top+Height); setcolor(WHITE); line(Left,Top,Left+Width,Top); line(Left,Top,Left,Top+Height); setcolor(BLACK); line(Left+Width,Top,Left+Width,Top+Height); line(Left,Top+Height,Left+Width,Top+Height); settextjustify(LEFT_TEXT,TOP_TEXT); setcolor(BLACK); outtextxy(Left + (Width/2) - textwidth(Caption)/2 + 1, Top + (Height/2) - textheight(Caption)/2 + 1, Caption); } void Button::MouseDown() { mouse.HideMouse(); setcolor(BLACK); line(Left,Top,Left+Width,Top); line(Left,Top,Left,Top+Height); setcolor(WHITE); line(Left+Width,Top,Left+Width,Top+Height); line(Left,Top+Height,Left+Width,Top+Height); mouse.ShowMouse(); } void Button::MouseUp() { mouse.HideMouse(); setcolor(WHITE); line(Left,Top,Left+Width,Top); line(Left,Top,Left,Top+Height); setcolor(BLACK); line(Left+Width,Top,Left+Width,Top+Height); line(Left,Top+Height,Left+Width,Top+Height); mouse.ShowMouse(); } void Button::EnableClickHandler() { if(State) { ButtonId = 0; State = false; return; } if( mouse.MouseInside(Left,Top,Left+Width,Top+Height) == 1) { if( mouse.GetButton() == MOUSE_LBUTTON) { MouseDown(); btnStatus = BUTTON_STATUS_DOWN; } else if(btnStatus == BUTTON_STATUS_DOWN && mouse.GetButton() == MOUSE_NORMAL) { MouseUp(); ButtonId = ID; btnStatus = BUTTON_STATUS_NORMAL; State = true; } } } /*------------------------------------------------------ End of Button Class ------------------------------------------------------*/ /*------------------------------------------------------ Window Class ------------------------------------------------------*/ class Window { private: int Left,Top,Width,Height; char Caption[50]; Button *CloseBtn; public: Window(int left, int top, int width, int height, char caption[]); void JCLogo(); void Draw(); void EnableClickHandler(); }; Window::Window(int left, int top, int width, int height, char caption[]) { Left = left; Top = top; Width = width; Height = height; strcpy(Caption,caption); } void Window::JCLogo() { /*********** Logo ************/ setcolor(3); setfillstyle(SOLID_FILL,3); fillellipse(Left+(BORDERWIDTH)+TITLEBARHEIGHT/2,Top+TITLEBARHEIGHT/2,TITLEBARHEIGHT/2-1,TITLEBARHEIGHT/2-1); setcolor(15); setfillstyle(SOLID_FILL,15); circle(Left+(BORDERWIDTH)+TITLEBARHEIGHT/2,Top+TITLEBARHEIGHT/2,TITLEBARHEIGHT/2-3); settextstyle(SMALL_FONT,0,0); outtextxy(Left+6,Top+4,"JC"); settextstyle(0,0,0); } void Window::Draw() { setfillstyle(SOLID_FILL,LIGHTGRAY); bar(Left,Top,Left+Width,Top+Height); setcolor(WHITE); line(Left,Top,Left+Width,Top); line(Left,Top,Left,Top+Height); setcolor(BLACK); line(Left,Top+Height,Left+Width,Top+Height); line(Left+Width,Top,Left+Width,Top+Height); setfillstyle(SOLID_FILL,BLUE); bar(Left+BORDERWIDTH,Top+BORDERWIDTH, Left+Width-(BORDERWIDTH*2),Top+TITLEBARHEIGHT); setcolor(WHITE); settextjustify(LEFT_TEXT,TOP_TEXT); outtextxy(Left+(BORDERWIDTH*2)+TITLEBARHEIGHT+2,Top+(BORDERWIDTH*2)+(TITLEBARHEIGHT/2)-(textheight(Caption)/2),Caption); CloseBtn = new Button(Left+Width-TITLEBARHEIGHT-1, Top+2,TITLEBARHEIGHT-2, TITLEBARHEIGHT-2, "X", 9809); CloseBtn->Draw(); JCLogo(); } void Window::EnableClickHandler() { CloseBtn->EnableClickHandler(); if (ButtonId == 9809) exit(0); } /*------------------------------------------------------ End of Window Class ------------------------------------------------------*/ /*------------------------------------------------------ Main Function ------------------------------------------------------*/ void main() { int gd=DETECT,gm,ch,errorcode; double opr1 = 0,opr2 = 0,result = 0,d=0; int Operation=0; double temp; char *chr,str[30]; int len; int x = 160,y = 130; int w = 50, h = 40; char deci[]={"."}; char btn[][3]={"AC","/","X","<-","7","8","9","-", "4","5","6","+","1","2","3","=","0",".","+/-"}; // initialize graphics and local variables initgraph(&gd,&gm,"c://turboc3//bgi"); // read result of initialization errorcode = graphresult(); if (errorcode != grOk)// an error occurred { cout<<"Graphics error :: "<<grapherrormsg(errorcode); cout <<"\n press any key to halt: "; getch(); exit(1);// terminate with an error code } mouse.InstallMouse(); /* Drawing a Calculator Window */ Window *pWindow = new Window(150,50,265,340,"Calculator"); pWindow->Draw(); /* Drawing Textbox */ TextBox *pTextBox = new TextBox(160,80,243,30,"",RIGHT_TEXT); pTextBox->Draw(); /* Drawing Buttons */ Button *pButton[19]; for (int i = 0;i<19;i++) { if(i == 15) h = 90; else h=40; pButton[i] = new Button(x,y,w,h,btn[i],i+1); pButton[i]->Draw(); x = x+65; if(i == 3 || i == 7 || i==11 || i== 15) { y = y+50; x = 160; } } while(1){ mouse.ShowMouse(); // To show mouse mouse.GetMouseStatus(); // To get position of mouse // Enabling click event on close button in window pWindow->EnableClickHandler(); // Enabling click event on buttons for(int k = 0;k<19;k++) pButton[k]->EnableClickHandler(); switch(ButtonId) { case 1: //AC pTextBox->Clear(); d = 0; opr1=0; opr2=0; result = 0; Operation = 0; break; case 2: //Divide opr1 = atof(pTextBox->GetText()); pTextBox->Clear(); Operation = DIVIDE; d = 0; break; case 3: //Multiply opr1 = atof(pTextBox->GetText()); pTextBox->Clear(); Operation = MULTIPLY; d=0; break; case 4: //Backspace strcpy(chr,pTextBox->GetText()); len=strlen(chr); if(chr[len-2] == deci[0]) { chr[len-1]=0; chr[len-2]=0; } else chr[len-1] = 0; pTextBox->Clear(); pTextBox->SetText(chr); break; case 5: //7 pTextBox->SetText("7"); break; case 6: //8 pTextBox->SetText("8"); break; case 7: //9 pTextBox->SetText("9"); break; case 8: // Subtraction opr1 = atoi(pTextBox->GetText()); pTextBox->Clear(); Operation = SUBTRACT; d=0; break; case 9: //4 pTextBox->SetText("4"); break; case 10: //5 pTextBox->SetText("5"); break; case 11: //6 pTextBox->SetText("6"); break; case 12: //Addition opr1 = atof(pTextBox->GetText()); pTextBox->Clear(); Operation = ADD; d=0; break; case 13: //1 pTextBox->SetText("1"); break; case 14: //2 pTextBox->SetText("2"); break; case 15: //3 pTextBox->SetText("3"); break; case 16: // Equal(=) opr2 = atof(pTextBox->GetText()); switch(Operation) { case ADD: result = opr1+opr2; break; case SUBTRACT: result = opr1-opr2; break; case MULTIPLY: result = opr1*opr2; break; case DIVIDE: result = opr1/opr2; break; } pTextBox->Clear(); pTextBox->SetText(gcvt(result,10,str)); opr1=0; opr2=0; result = 0; Operation=0; break; case 17: //0 pTextBox->SetText("0"); break; case 18: // Decimal(.) if(d == 0) { d = 1; pTextBox->SetText("."); } break; case 19: //Plus & Minus (+/-) temp = atof(pTextBox->GetText()); temp = temp* -1; pTextBox->Clear(); pTextBox->SetText(gcvt(temp,10,str)); break; } while(kbhit()){ ch = getch(); if (ch == 27) //ESC key pressed exit(0); } } }

Download

Click here to view and download the source code of GUI Calculator (70 KB).

Click here to download the executable file of GUI Calculator (67 KB) (Please note that it is a 16-bit executable and will not run on 64-bit systems).