Hesap Makinesi

CorsaiR · 6 Ağu 2007

java ile yazılmış basit bir örnek program
//Title: Calculator
//Version:
//Copyright: Copyright (c) 1999
//Author: ALI FIRTINA
//Company: FIRTINA
//Description: Your description

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;

public class Calculator extends Applet
{
TextField display; // Display field
int x; // starting x coordination of panel
int y; // starting y coordination of panel
int width; // width of the one button
int height; // height of the one button
String number1; // number pressed with button
char op; // operation pressed with button
char lastop; // save last opration before =
int number2; // change number to integer
int controlsum; // control sum if integer or double
double sum; // sum of the operations
boolean button[]; // button press or not
boolean sec; // if = pressed more than one

// INIT METHOD
public **** init()
{
display= new TextField("0",11); // initilaze text field
display.setEditable(false); // display not editable
button= new boolean[16]; // memory al******** of array
x=105; // declare atarting x coordinate of panel
y=75; // declare starting y coordinate of panel
width=50; // declare width of the one button
height=50; // declare height of the one button
sum=0; // initilaze sum
setBackground(Color.white); //set background color
number1=""+0; // initilaze number1
number2=0; // initilaze number2
sec=false; // initilaze sec for =
for (int i=0;i<=15;i++) // set buttons first position
button=true;
lastop=' ';
op=' ';
add(display); // add text field
}

// PAINT METHOD
public **** paint(Graphics g)
{
int a; // for writing buttons name
int b; // for writing button name
Font f = new Font ("TimesRoman",Font.BOLD,width/2); // set font
g.setFont(f); // set font to graphic object
g.setColor(Color.lightGray);
// draw buttons
for (int i=0;i<=15;i++)
{
int c=0;
if (i>3) c=1;
if (i>7) c=2;
if (i>11) c=3;
g.fill3DRect(x+((i%4)*width),y+(c*height),width,height,button);
}

g.setColor(Color.black);
a=x+(2*(width/4));
b=y+(2*(height/3));
// draw button names
g.drawString("1",a,b);
g.drawString("2",a+width,b);
g.drawString("3",a+(2*width),b);
g.drawString("4",a,b+height);
g.drawString("5",a+width,b+height);
g.drawString("6",a+(2*width),b+height);
g.drawString("7",a,b+(2*height));
g.drawString("8",a+width,b+(2*height));
g.drawString("9",a+(2*width),b+(2*height));
g.drawString("/",a+(3*width),b);
g.drawString("*",a+(3*width),b+height);
g.drawString("-",a+(3*width),b+(2*height));
g.drawString("+",a+(3*width),b+(3*height));
g.drawString("0",a,b+(3*height));
g.drawString("=",a+width,b+(3*height));
g.drawString("C",a+(2*width),b+(3*height));

}
// MOUSE DOWN METHOD
public boolean mouseDown (Event evt,int xcor,int ycor)
{
for (int i=0;i<=15;i++) // initial position of buttons
button=true;

// if 1. button is pressed
if (xcor<(x+width) && xcor>x && ycor<(y+height) && ycor>y)
{
number1+=1;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[0]=false;
}
// if 2. button pressed
else if (xcor<(x+(2*width)) && xcor>(x+width) && ycor<(y+height) && ycor>y)
{
number1+=2;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[1]=false;
}
// if 3. button pressed
else if (xcor<(x+(3*width)) && xcor>(x+(2*width)) && ycor<(y+height) && ycor>y)
{
number1+=3;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[2]=false;
}
// if 4. button pressed
else if (xcor<(x+(4*width)) && xcor>x+(3*width) && ycor<(y+height) && ycor>y)
{
lastop=op;
op='/';
calc();
button[3]=false;
}
// if 5. button pressed
else if (xcor<(x+width) && xcor>x && ycor<(y+(2*height)) && ycor>(y+height))
{
number1+=4;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[4]=false;
}
// if 6. button pressed
else if (xcor<(x+(2*width)) && xcor>(x+width) && ycor<(y+(2*height)) && ycor>(y+height))
{
number1+=5;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[5]=false;
}
// if 7. button pressed
else if (xcor<(x+(3*width)) && xcor>(x+(2*width)) && ycor<(y+(2*height)) && ycor>(y+height))
{
number1+=6;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[6]=false;
}
// if 8. button pressed
else if (xcor<(x+(4*width)) && xcor>(x+(3*width)) && ycor<(y+(2*height)) && ycor>(y+height))
{
lastop=op;
op='*';
calc();
button[7]=false;
}
// if 9. button pressed
else if (xcor<(x+width) && xcor>x && ycor<(y+(3*height)) && ycor>(y+(2*height)))
{
number1+=7;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[8]=false;
}
// if 10. button pressed
else if (xcor<(x+(2*width)) && xcor>(x+width) && ycor<(y+(3*height)) && ycor>(y+(2*height)))
{
number1+=8;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[9]=false;
}
// if 11. button pressed
else if (xcor<(x+(3*width)) && xcor>(x+(2*width)) && ycor<(y+(3*height)) && ycor>(y+(2*height)))
{
number1+=9;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[10]=false;
}
// if 12. button pressed
else if (xcor<(x+(4*width)) && xcor>(x+(3*width)) && ycor<(y+(3*height)) && ycor>(y+(2*height)))
{
lastop=op;
op='-';
calc();
button[11]=false;
}
// if 13. button pressed
else if (xcor<(x+width) && xcor>x && ycor<(y+(4*height)) && ycor>(y+(3*height)))
{
number1+=0;
number2= Integer.parseInt(number1);
display.setText(""+number2);
button[12]=false;
}
// if 14. button pressed
else if (xcor<(x+(2*width)) && xcor>(x+width) && ycor<(y+(4*height)) && ycor>(y+(3*height)))
{
lastop=op;
op='=';
calc();
button[13]=false;
}
// if 15. button pressed
else if (xcor<(x+(3*width)) && xcor>(x+(2*width)) && ycor<(y+(4*height)) && ycor>(y+(3*height)))
{
op='C';
calc();
button[14]=false;
}
// if 16. button pressed
else if (xcor<(x+(4*width)) && xcor>(x+(3*width)) && ycor<(y+(4*height)) && ycor>(y+(3*height)))
{
lastop=op;
op='+';
calc();
button[15]=false;
}
repaint(); // draw buttons with new positions
return true;
}
// MOUSE UP METHOD
public boolean mouseUp (Event evt,int xco,int yco)
{
// set buttons new position
for (int i=0;i<=15;i++)
button=true;
repaint ();
return true;
}
// CALCULATION METHOD
public **** calc()
{
switch (op)
{
case '+': // if operation +
number2= Integer.parseInt(number1); //parse string to int
if (lastop!='=' && lastop !=' ')
{
op=lastop;
lastop='=';
calc();

op='+';
sec=false;
break;
}
//else
if (sum!=0) // if sum not set
sum+=number2;
else sum=number2;
number1=""+0; // clear number
controlsum=(int)sum; // if sum integer or float
if (controlsum==sum) display.setText(""+controlsum);
else display.setText(""+sum);
sec=false;
break;
case '-': // if operation -
number2= Integer.parseInt(number1); // parse string to int
if (lastop != '=' && lastop !=' ')
{
op=lastop;
lastop='=';
calc();

op='-';
sec=false;
break;
}
if (sum!=0) // if sum not set
sum-=number2;
else sum=number2;
number1=""+0; // clear number
controlsum=(int)sum; // if sum integer or float
if (controlsum==sum) display.setText(""+controlsum);
else display.setText(""+sum);
sec=false;
break;
case '/': // if operation /
number2= Integer.parseInt(number1); // parse string to int
if (lastop!='=' && lastop !=' ')
{
op=lastop;
lastop='=';
calc();

op='/';
sec=false;
break;
}
if (number2==0)
{
sec=false;
break;
}
if (sum!=0)
sum/=number2;
else sum=number2;
number1=""+0; // clear number
controlsum=(int)sum; // if sum integer or float
if (controlsum==sum) display.setText(""+controlsum);
else display.setText(""+sum);
sec=false;
break;
case '*': // if operation *
number2= Integer.parseInt(number1); // parse string to int
if (lastop!='=' && lastop !=' ')
{
op=lastop;
lastop='=';
calc();

op='*';
sec=false;
break;
}
if (number2==0)
{
sec=false;
break;
}
if (sum!=0)
sum*=number2;
else sum=number2;
number1=""+0;
controlsum=(int)sum; // if sum integer or float
if (controlsum==sum) display.setText(""+controlsum);
else display.setText(""+sum);
sec=false;
break;
case 'C': // if operation clear
sum=0;
number1=""+0;
lastop=' ';
op=' ';
controlsum=(int)sum; // if sum integer or float
if (controlsum==sum) display.setText(""+controlsum);
else display.setText(""+sum);
sec=false;
break;
case '=': // if operation is equal to
if(sec)
{
controlsum=(int)sum; // if sum integer or float
if (controlsum==sum) display.setText(""+controlsum);
else display.setText(""+sum);
number1=""+0;
}
else
{
op=lastop;
calc();
}
sec=true;
break;

}
}

}

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