Qantler Technologies Fresher Interview Questions with Answers – Part 3
This blog explains about Qantler Technologies Fresher Interview Questions with Answers – Part 3 and is given below :
1. Sort the given user input in descending order.
In order to sort in descending order we just need to change the logic array[j] > array[j+1] to array[j] < array[j+1] in the above program. Complete code as follows:
import java.util.Scanner;
class BubbleSortExample {
public static void main(String []args) {
int num, i, j, temp;
Scanner input = new Scanner(System.in);
System.out.println(“Enter the number of integers to sort:”);
num = input.nextInt();
int array[] = new int[num];
System.out.println(“Enter ” + num + ” integers: “);
for (i = 0; i < num; i++)
array[i] = input.nextInt();
for (i = 0; i < ( num – 1 ); i++) {
for (j = 0; j < num – i – 1; j++) {
if (array[j] < array[j+1])
{
temp = array[j];
array[j] = array[j+1];
array[j+1] = temp;
}
}
}
System.out.println(“Sorted list of integers:”);
for (i = 0; i < num; i++)
System.out.println(array[i]);
}
}
Output:
Enter the number of integers to sort:6
Enter 6 integers:
89
12
45
9
56
102
Sorted list of integers:
102
89
56
45
12
9
2. Write a program to generate Fibonacci series (0,1,1,2,3,5,8…).
publicclassFibonacci{
publicstaticvoid main(String[] args){
int n =10, t1 =0, t2 =1;
System.out.print(“First “+ n +” terms: “);
for(int i =1; i <= n;++i)
{
System.out.print(t1 +” + “);
int sum = t1 + t2;
t1 = t2;
t2 = sum;
}
}
}
When you run the program, the output will be:
21.0 + 1 + 1 + 2 + 3 + 5 + 8 + 13 + 21 + 34 +
3. Write a program to reverse a given number.
- Reverse a Number using a while loop in Java
- public class ReverseNumber {
- public static void main(String[] args) {
- int num = 1234, reversed = 0;
- while(num != 0) {
- int digit = num % 10;
- reversed = reversed * 10 + digit;
- num /= 10;
- }
- System.out.println(“Reversed Number: ” + reversed);
- }
- }
- When you run the program, the output will be:
- Reversed Number: 4321
4. Write a program to do 2 X 2 matrix multiplication:
Get input, generate and show the first 2 X 2 matrix.
Get input, generate and show the second 2 X 2 matrix.
Multiple the matrixes and show the output matrix.
| // Java program to multiply two square
// matrices. import java.io.*;
class GFG {
static int N = 4;
// This function multiplies mat1[][] // and mat2[][], and stores the result // in res[][] static void multiply(int mat1[][], int mat2[][], int res[][]) { int i, j, k; for (i = 0; i < N; i++) { for (j = 0; j < N; j++) { res[i][j] = 0; for (k = 0; k < N; k++) res[i][j] += mat1[i][k] * mat2[k][j]; } } }
// Driver code public static void main (String[] args) { int mat1[][] = { {1, 1, 1, 1}, {2, 2, 2, 2}, {3, 3, 3, 3}, {4, 4, 4, 4}};
int mat2[][] = { {1, 1, 1, 1}, {2, 2, 2, 2}, {3, 3, 3, 3}, {4, 4, 4, 4}};
// To store result int res[][] = new int[N][N] ; int i, j; multiply(mat1, mat2, res);
System.out.println(“Result matrix” + ” is “); for (i = 0; i < N; i++) { for (j = 0; j < N; j++) System.out.print( res[i][j] + ” “); System.out.println(); } } }
// This code is contributed by anuj_67. |
Output:
Result matrix is
10 10 10 10
20 20 20 20
30 30 30 30
40 40 40 40
5. Write a program to print pyramid using numbers:
1
232
3 4 5 4 3
4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5
Java Program :
- importutil.Scanner;
- public class MainClass
- {
- public static void main(String[] args)
- {
- Scanner sc = new Scanner(System.in);
- //Taking rows value from the user
- System.out.println("How many rows you want in this pattern?");
- int rows = sc.nextInt();
- System.out.println("Here is your pattern….!!!");
- for (int i = 1; i <= rows; i++)
- {
- for (int j = 1; j <= i; j++)
- {
- System.out.print(j+" ");
- }
- System.out.println();
- }
- //Close the resources
- close();
- }
- }
Output :
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
6. Write a program to find the factorial of a given number using recursion.
/**
* @author: BeginnersBook.com
* @description: User would enter the 10 elements
* and the program will store them into an array and
* will display the sum of them.
*/import java.util.Scanner;
class FactorialDemo{
public static void main(String args[]){
//Scanner object for capturing the user input
Scanner scanner = new Scanner(System.in);
System.out.println(“Enter the number:”);
//Stored the entered value in variable
int num = scanner.nextInt();
//Called the user defined function fact
int factorial = fact(num);
System.out.println(“Factorial of entered number is: “+factorial);
}
static int fact(int n)
{
int output;
if(n==1){
return 1;
}
//Recursion: Function calling itself!!
output = fact(n-1)* n;
return output;
}
}
Output:
Enter the number:5Factorial of entered number is: 120
7. Write a program to find duplicates in an array.
Java Code:
public class Exercise13 {
public static void main(String[] args)
{
String[] my_array = {“bcd”, “abd”, “jude”, “bcd”, “oiu”, “gzw”, “oiu”};
for (int i = 0; i < my_array.length-1; i++)
{
for (int j = i+1; j < my_array.length; j++)
{
if( (my_array[i].equals(my_array[j])) && (i != j) )
{
System.out.println(“Duplicate Element is : “+my_array[j]);
}
}
}
}
}
Copy
Sample Output:
Duplicate Element is : bcd
Duplicate Element is : oiu
8. Write a program to remove special characters from a give string.
public class App{
public static void main(String args[]) {
String text = “This – text ! has \\ /allot # of % special % characters”;
text = text.replaceAll(“[^a-zA-Z0-9]”, “”);
System.out.println(text);
String html = “This is bold”;
html = html.replaceAll(“[^a-zA-Z0-9\\s+]”, “”);
System.out.println(html);
}
}
Output
This text has a lot of special characters b.
This is bold b
REFERENCES : Qantler Technologies Fresher Interview Questions with Answers – Part 1 & 2
https://payilagam.com/blogs/qantler-technologies-fresher-interview-questions-with-answers-part-1/
https://payilagam.com/blogs/qantler-technologies-fresher-interview-questions-with-answers-part-2/