SOME COMPUTER STUFF ON C,JAVA,TALLY,BCA,SOLVED PAPERS

import java.io.*; import java.lang.*; import javax.swing.*; import javax.swing.event.*; import java.awt.*; import java.awt.event.*; import calculate.calc; public class cal implements ActionListener { JFrame jf; JToolBar jtb; JButton jbadd,jbsub,jbmul,jbdiv,jbclear,jbequal; JTextField jtf; calc ca2=new calc(); int val; int flag=0; cal() { frame(); toolbar(); textfield(); button(); jf.setVisible(true); } void frame() { jf=new JFrame("calculator"); jf.setSize(500,500); jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE); } void toolbar() { jtb=new JToolBar(); jf.add(jtb,BorderLayout.NORTH); } void textfield() { jtf=new JTextField(); jtb.add(jtf);         jtf.addMouseListener(new MouseAdapter(){                  public void mouseClicked(MouseEvent e){                 jtf.setText("");             }    ...

//d1.java import java.applet.*; import javax.swing.*; import javax.swing.event.*; import java.awt.event.*; import java.awt.*; import java.io.*; import java.lang.*; public class d1 implements ActionListener { JButton jb; JFrame jf; JTextField jtf; d1() { //frame should always be called first frame(); button(); textfield(); jf.setVisible(true); d2 a=new d2(jb); } public void button() { jb=new JButton(); jf.add(jb,BorderLayout.NORTH); jb.addActionListener(this); } public void textfield() { jtf=new JTextField(); jf.add(jtf,BorderLayout.CENTER); } public void frame() { jf=new JFrame("p2 frame"); jf.setSize(500,500); jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE); //v. imp line otherwise the swing will not close } public void actionPerformed(ActionEvent ae) { if(ae.getActionCommand().equals(jb.getText())) { } } public static void main(String args[])throws IOException { SwingUtilities.invokeLater( new Runnable() { public v...

We can return a multi ple lines   string in java by using "\n" Example: import java.io.*; public class pack1 { public static String make(int n) { String s=""; int i,j,k; for(i=0; i<n;i++) { for(k=n-i-1;k>=0;k--) s=s+" "; for(j=1;j<=i*2+1;j++) s=s+"*"; s+="\n"; } return s; } }