Number Crunching in c | Numbers Programs in c language | Top 15 Useful Examples of Number Programs In c

Level 1 in Java Coding Problems for Interviews

Q1. Reverse a String in Java

You are given a string s. You need to reverse the string.

Example 1:

Input:
s = LearnKro
Output: orKnraeL

class LearnKro
{
    public static void main(String args[])throws IOException
    {
        BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(read.readLine());
        
        while(t-- >0)
        {
            String str = read.readLine();
            System.out.println(new Reverse().reverseWord(str));
        }
    }
}// } Driver Code Ends
//User function Template for Java

class Reverse
{
    // Complete the function
    // str: input string
    public static String reverseWord(String str)
    {
        int k= str.length();
        String s = "";
       for(int i=str.length()-1;i>=0;i--){
        s = s+str.charAt(i);
  }
  return s;
    }
}

Q2. Reverse String words in a given string using Java

Given a String S, reverse the string without reversing its individual words. Words are separated by dots.

Input:
S = i.like.this.program.very.much
Output: much.very.program.this.like.i

import java.util.*;
class LearnKro {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while (t > 0) {
            String s = sc.next();
            Solution obj = new Solution();
            System.out.println(obj.reverseWords(s));
            t--;
        }
    }
}
// } Driver Code Ends
class Solution 
{
    //Function to reverse words in a given string
    public static String reverseWords(String S)
    {
        String[] str = S.split("[.]", 0);
        String abc = "";
        
        for(int i = str.length - 1; i >= 0; i--) {
            if(i == 0) {
                abc = abc + str[i];
            } else {
                abc = abc + str[i] + ".";
            }
        }
        return abc;
    }
}

Q3. Longest Common Prefix in an Array 

Given a array of N strings, find the longest common prefix among all strings present in the array.

Input:
N = 4
arr[] = {LearnKro, kro, Learn,Java}
Output: kro
Explanation: "kro" is the longest common
prefix in all the given strings.