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suganya
java
2 Answer(s)      4 years and 4 months ago
Posted in : Design concepts & design patterns


implement lisp-like list in java.write basic operations such as 'car','cdr',and 'cons'.if L is a list[3,0,2,5],L.car()returns[0,2,5].

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August 18, 2010 at 10:51 AM


Hi Friend,

Try the following code:

import java.util.*;
class Lisp
{
public int car(List l){
Object ob=l.get(0);
String st=ob.toString();
return Integer.parseInt(st);
}
public List cdr(List l){
Object ob=l.remove(0);
Object obj[]=l.toArray();
List list=Arrays.asList(obj);

return list;
}

public static void main(String[] args)
{
List<Integer> l=new ArrayList<Integer>();
l.add(3);
l.add(0);
l.add(2);
l.add(5);
Lisp L=new Lisp();
int val=L.car(l);
System.out.println(val);
List list=L.cdr(l);
System.out.print(list);

}
}

Thanks


September 12, 2010 at 10:03 PM


// LISP LIST PROGRAM BY WHITMAN KUMARESH
// any queries -> kumareshwhitman@gmail.com

import java.io.*;
import java.lang.*;
import java.util.*;

class lisp {

String L;
DataInputStream im = new DataInputStream(System.in);

public void create() {
try {
System.out.println("Enter the String :");
L = im.readLine();
} catch (Exception e) {
System.out.println("Error...!");
}
}

public void display() {
System.out.println("The list is: " + L);
}

public void car() {
System.out.println("The first no is [car()]: " + L.substring(0, 1));
}

public void cdr() {
System.out.println("The String is [cdr()]: " + L.substring(1, L.length()));
}

public void setcdr() {
try {
System.out.println("Enter the element to set :");
String tmp1 = im.readLine();
StringBuffer sb = new StringBuffer(L);
L = new String(sb.delete(1, L.length()));
L = L + tmp1;
System.out.println("The String is [setcdr()]: " + L);
} catch (Exception e) {
System.out.println("Error...!");
}
}

public void setcar() {
try {
System.out.println("Enter the element to set :");
String tmp = im.readLine();
StringBuffer sb = new StringBuffer(L);
L = new String(sb.delete(0, 1));
L = tmp + L;
System.out.println("The String is [setcar()] :" + L);
} catch (Exception e) {
System.out.println("Error...!");
}
}

public void first_last() {
int t = L.length();
System.out.println("The String is [first_last()]: " + "First : " + L.substring(0, 1) + "\tLast :" + L.substring(t - 1, t));
}

public void nthlist() {
try {
System.out.println("Enter the value of 'n' :");
int n = Integer.parseInt(im.readLine());
System.out.println("The String is [nthlist()]: " + L.charAt(n));
} catch (Exception e) {
System.out.println("Error...!");
}
}

public void nthcdr() {
try {
System.out.println("Enter the value of 'n' :");
int n = Integer.parseInt(im.readLine());
for (int i = 1; i <= n; i++) {
System.out.println("The String is [nthcdr()]: " + L.substring(i, L.length()));
}
} catch (Exception e) {
System.out.println("Error...!");
}
}

public void cadr() {
System.out.println("The String is [cadr()] :" + L.substring(0, 1) + "" + L.substring(1, L.length()));
}

public void length() {
System.out.println("The length of L: " + L.length());
}

public void cons() {
try {
String temp;

System.out.print("Enter the element to be added to list: ");
temp = im.readLine();
L = temp + L;
System.out.println("The result of [cons()]: " + L);
} catch (Exception e) {
System.out.println("Error...!");
}
}
}

class lisplist {

public static void main(String args[]) {
lisp w = new lisp();
System.out.println("The list is: " + w.L);
try {
int n;
DataInputStream in = new DataInputStream(System.in);
whit:
{
System.out.println("\nLisp list program by Whitman for my sister Dhana...");
System.out.println("1.Create()\t2.Display()\t3.Car()\t4.Cdr()\n5.Cons()\t6.Length()\t7.Nthcdr()\t8.Setcar()\n9.Setcdr()\t10.Nthlist()\t11.First_last()\t12.Cadr()\n13.Exit");
do {
System.out.print("\nEnter your option: ");
n = Integer.parseInt(in.readLine());
switch (n) {
case 1:
w.create();
break;
case 2:
w.display();
break;
case 3:
w.car();
break;
case 4:
w.cdr();
break;
case 5:
w.cons();
break;
case 6:
w.length();
break;
case 7:
w.nthcdr();
break;
case 8:
w.setcar();
break;
case 9:
w.setcdr();
break;
case 10:
w.nthlist();
break;
case 11:
w.first_last();
break;
case 12:
w.cadr();
break;
case 13:
System.exit(0);
default:
System.out.println("Wrong input");
System.exit(0);
}
} while (n <= 13);

}

} catch (Exception e) {
System.out.println("Error...!");
}
}
}

// Enjoy...!


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