Question

Design a class to overload the method display(........) as follows:

1. void display(int num): checks and prints whether the number is a perfect square or not.
2. void display(String str, char ch): checks and prints if the word str contains the letter ch or not.
3. void display(String str): checks and print the number of special characters present in the word str. 

Write a suitable main() method.

Answer 1

import java.util.*;
class FQ21
{
void display(int num)
{double y, ans;
y = (int)Math.sqrt(num);
ans = y * y;
if {ans == num)
System.out.println("Perfect Square");
else
System.out.println("Not a perfect square");
}

void display(String str, char ch)
{int flag = 1;
for (int i = 0; i < str.length(); i++)
{if (str.charAt(i) == ch)
flag = 1;
break;
}
if (flag == 1) System.out.println("The String contains the letter " + ch);
else System.out.println("The String does not contain the letter " + ch);
}

void display(String str)
{char ch;
int cnt = 0;
for (int i = 0; i < str.length(); i++)
{ ch = str.charAt(i);
if(ch != ' ' && Character.isDigit(ch) == false && Character.isLetter(ch) == false)
cnt++;
}
System.out.print("Special characters in the word = " + cnt);
}

public static void main(String arg[])
{Scanner ob = new Scanner(System.in);
FQ21 qq = new FQ21(); // Create the object of the class

System.out.println("Enter a number");
qq.display(ob.nextInt()); // Method call
System.out.println("Enter a String and a character");
qq.display(ob.next(), ob.next().charAt(0)); // Method call
System.out.println("Enter the String with special characters");
qq.display(ob.next()); // Method call
}}