Simple Calculator Program in Java Using AWT (Grid Layout)
Aim:
To write a Java program that works as a simple calculator. Use a grid layout to arrange buttons for the digits and for the +, -, *, % operations. Add a text field to display the result.
Source Code: Java Gridlayout Example
//import package to create simple calculator
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class Week9 extends Frame implements ActionListener
{
int i=0,temp=0;
char a;
float stk[];
int top;
TextField t;
Button dot,mod,b,one,two,three,four,five,six,seven,eight,nine,
zero,add,sub,mul,div,eq,sine,sqrt,cbrt;
GridBagConstraints gc;
Week9()
{
super("My Calculator");
stk=new float[20];
top=-1;
gc=new GridBagConstraints(); //creating gridlayout
//creating textfield and button on simple calculator
t=new TextField("");
b=new Button("Reset");
one=new Button(" 1 ");
two=new Button(" 2 ");
three=new Button(" 3 ");
four=new Button(" 4 ");
five=new Button(" 5 ");
six=new Button(" 6 ");
seven=new Button(" 7 ");
eight=new Button(" 8 ");
nine=new Button(" 9 ");
zero=new Button(" 0 ");
add=new Button(" + ");
sub=new Button(" - ");
mul=new Button(" * ");
div=new Button(" / ");
eq=new Button(" = ");
dot=new Button("...");
mod=new Button(" % ");
sine=new Button(" sin ");
sqrt=new Button(" sqrt ");
cbrt=new Button(" cbrt ");
setSize(250,250);
setLocation(500,200);
setLayout(new GridBagLayout());
addcomp(one,1,1,1,1);
addcomp(two,1,2,1,1);
addcomp(three,1,3,1,1);
addcomp(four,1,4,1,1);
addcomp(five,2,1,1,1);
addcomp(six,2,2,1,1);
addcomp(seven,2,3,1,1);
addcomp(eight,2,4,1,1);
addcomp(nine,3,1,1,1);
addcomp(zero,3,2,1,1);
addcomp(mul,3,3,1,1);
addcomp(div,3,4,1,1);
addcomp(add,4,1,1,1);
addcomp(sub,4,2,1,1);
addcomp(eq,4,3,1,1);
addcomp(mod,4,4,1,1);
addcomp(dot,5,1,1,1);
addcomp(sine,5,2,1,1);
addcomp(sqrt,5,3,1,1);
addcomp(cbrt,5,4,1,1);
addcomp(new Label(""),7,1,4,1);
addcomp(t,8,1,4,1);
addcomp(new Label(""),9,1,4,1);
addcomp(b,10,2,2,1);
setVisible(true);
one.addActionListener(this);
two.addActionListener(this);
three.addActionListener(this);
four.addActionListener(this);
five.addActionListener(this);
six.addActionListener(this);
seven.addActionListener(this);
eight.addActionListener(this);
nine.addActionListener(this);
zero.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
add.addActionListener(this);
sub.addActionListener(this);
eq.addActionListener(this);
mod.addActionListener(this);
dot.addActionListener(this);
sine.addActionListener(this);
sqrt.addActionListener(this);
cbrt.addActionListener(this);
b.addActionListener(this);
}
public void addcomp(Component cc,int r,int c,int w,int h)
{
gc.gridx=c;
gc.gridy=r;
gc.gridwidth=w;
gc.gridheight=h;
gc.fill=gc.BOTH;
add(cc,gc);
}
// performing action on simple calculator
public void actionPerformed(ActionEvent ae)
{ // comparing input value in simple calculator
if(ae.getSource()==b)
{
t.setText("");
}
if(ae.getSource()==one)
{
if(temp==1)
func();
t.setText(t.getText()+"1");
}
if(ae.getSource()==two)
{
if(temp==1)
func();
t.setText(t.getText()+"2");
}
if(ae.getSource()==three)
{
if(temp==1)
func();
t.setText(t.getText()+"3");
}
if(ae.getSource()==four)
{
if(temp==1)
func();
t.setText(t.getText()+"4");
}
if(ae.getSource()==five)
{
if(temp==1)
func();
t.setText(t.getText()+"5");
}
if(ae.getSource()==six)
{
if(temp==1)
func();
t.setText(t.getText()+"6");
}
if(ae.getSource()==seven)
{
if(temp==1)
func();
t.setText(t.getText()+"7");
}
if(ae.getSource()==eight)
{
if(temp==1)
func();
t.setText(t.getText()+"8");
}
if(ae.getSource()==nine)
{
t.setText(t.getText()+"9");
if(temp==1)
func();
}
if(ae.getSource()==zero)
{
t.setText(t.getText()+"0");
if(temp==1)
func();
}
if(ae.getSource()==add||ae.getSource()==sub||ae.getSource()==mul||
ae.getSource()==div||ae.getSource()==mod||ae.getSource()==sqrt||
ae.getSource()==cbrt||ae.getSource()==sine)
{
String s;
s=t.getText();
float num1=0,num2=0,num3=0;
float n=Float.parseFloat(s);
push(n);
if(ae.getSource()==add)
a='+';
if(ae.getSource()==sub)
a='-';
if(ae.getSource()==mul)
a='*';
if(ae.getSource()==div)
a='/';
if(ae.getSource()==mod)
a='%';
t.setText("");
if(ae.getSource()==sqrt)
{
double num=pop();
t.setText(Double.toString(Math.sqrt(num)));
}
if(ae.getSource()==cbrt)
{
double num=pop();
t.setText(Double.toString(Math.cbrt(num)));
}
if(ae.getSource()==sine)
{
double num=pop();
t.setText(Double.toString(Math.sin(num)));
}
}
if(ae.getSource()==eq)
{
float num1=0,num2=0,num3=0,temp1;
String s=t.getText();
float n=Float.parseFloat(s);
push(n);
num1=pop();
num2=pop();
switch(a)
{
// perform arithmetic operation
case '+' : num3=num1+num2;push(num3);break;
case '-' : num3=num2-num1;push(num3);break;
case '*' : num3=num1*num2;push(num3);break;
case '/' : num3=num2/num1;push(num3);break;
case '%' : num3=num2%num1;push(num3);break;
}
if(i==1)
{
t.setText(Float.toString(num3));
i=0;
}
else
t.setText(Integer.toString((int)num3));
temp=1;
}
if(ae.getSource()==dot)
{
i=1;
t.setText(t.getText()+".");
}
}
public void push(float a)
{
top++;
stk[top]=a;
}
public float pop()
{
float num=stk[top];
top--;
return(num);
}
public void func()
{
t.setText("");
temp=0;
}
public static void main(String rr[])throws Exception
{
new Week9();
}
}
Output of simple calculator:
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