Interview Q and A
Odd numbers and even numbers
import java.util.Scanner;
class OddOrEven
{
public static void main(String args[])
{
int x;
System.out.println("Enter an integer to check if it is odd or even ");
Scanner in = new Scanner(System.in);
x = in.nextInt();
if ( x % 2 == 0 )
System.out.println("You entered an even number.");
else
System.out.println("You entered an odd number.");
}
}
Java program to convert
Fahrenheit to Celsius
import java.util.*;
class FahrenheitToCelsius {
public static void main(String[] args) {
float temperatue;
Scanner in = new Scanner(System.in);
System.out.println("Enter temperatue in Fahrenheit");
temperatue = in.nextInt();
temperatue = (temperatue - 32)*5/9;
System.out.println("Temperatue in Celsius = " + temperatue);
}
}
Java program to find largest of three number
import java.util.Scanner;
class LargestOfThreeNumbers
{
public static void main(String args[])
{
int x, y, z;
System.out.println("Enter three integers ");
Scanner in = new Scanner(System.in);
x = in.nextInt();
y = in.nextInt();
z = in.nextInt();
if ( x > y && x > z )
System.out.println("First number is largest.");
else if ( y > x && y > z )
System.out.println("Second number is largest.");
else if ( z > x && z > y )
System.out.println("Third number is largest.");
else
System.out.println("Entered numbers are not distinct.");
}
}
java program to find factorial
import java.util.Scanner;
class Factorial
{
public static void main(String args[])
{
int n, c, fact = 1;
System.out.println("Enter an integer to calculate it's factorial");
Scanner in = new Scanner(System.in);
n = in.nextInt();
if ( n < 0 )
System.out.println("Number should be non-negative.");
else
{
for ( c = 1 ; c <= n ; c++ )
fact = fact*c;
System.out.println("Factorial of "+n+" is = "+fact);
}
}
}
Java program to print Floyd's triangle
import java.util.Scanner;
class FloydTriangle
{
public static void main(String args[])
{
int n, num = 1, c, d;
Scanner in = new Scanner(System.in);
System.out.println("Enter the number of rows of floyd's triangle you want");
n = in.nextInt();
System.out.println("Floyd's triangle :-");
for ( c = 1 ; c <= n ; c++ )
{
for ( d = 1 ; d <= c ; d++ )
{
System.out.print(num+" ");
num++;
}
System.out.println();
}
}
}
Java program to reverse a string
import java.util.*;
class ReverseString
{
public static void main(String args[])
{
String original, reverse = "";
Scanner in = new Scanner(System.in);
System.out.println("Enter a string to reverse");
original = in.nextLine();
int length = original.length();
for ( int i = length - 1 ; i >= 0 ; i-- )
reverse = reverse + original.charAt(i);
System.out.println("Reverse of entered string is: "+reverse);
}
}
Reverse string using
StringBuffer class
class InvertString
{
public static void main(String args[])
{
StringBuffer a = new StringBuffer("Java programming is fun");
System.out.println(a.reverse());
}
}
Java program to check palindrome
import java.util.*;
class Palindrome
{
public static void main(String args[])
{
String original, reverse="";
Scanner in = new Scanner(System.in);
System.out.println("Enter a string to check if it is a palindrome");
original = in.nextLine();
int length = original.length();
for ( int i = length - 1 ; i >= 0 ; i-- )
reverse = reverse + original.charAt(i);
if (original.equals(reverse))
System.out.println("Entered string is a palindrome.");
else
System.out.println("Entered string is not a palindrome.");
}
}
Another method to check
palindrome:
mport java.util.*;
class Palindrome
{
public static void main(String args[])
{
String inputString;
Scanner in = new Scanner(System.in);
System.out.println("Input a string");
inputString = in.nextLine();
int length = inputString.length();
int i, begin, end, middle;
begin = 0;
end = length - 1;
middle = (begin + end)/2;
for (i = begin; i <= middle; i++) {
if (inputString.charAt(begin) == inputString.charAt(end)) {
begin++;
end--;
}
else {
break;
}
}
if (i == middle + 1) {
System.out.println("Palindrome");
}
else {
System.out.println("Not a palindrome");
}
}
}
Java program to reverse number
import java.util.Scanner;
class ReverseNumber
{
public static void main(String args[])
{
int n, reverse = 0;
System.out.println("Enter the number to reverse");
Scanner in = new Scanner(System.in);
n = in.nextInt();
while( n != 0 )
{
reverse = reverse * 10;
reverse = reverse + n%10;
n = n/10;
}
System.out.println("Reverse of entered number is "+reverse);
}
}
Java program to compare two strings
import java.util.Scanner;
class CompareStrings
{
public static void main(String args[])
{
String s1, s2;
Scanner in = new Scanner(System.in);
System.out.println("Enter the first string");
s1 = in.nextLine();
System.out.println("Enter the second string");
s2 = in.nextLine();
if ( s1.compareTo(s2) > 0 )
System.out.println("First string is greater than second.");
else if ( s1.compareTo(s2) < 0 )
System.out.println("First string is smaller than second.");
else
System.out.println("Both strings are equal.");
}
}
Java program to find all substrings of a string
import java.util.Scanner;
class SubstringsOfAString
{
public static void main(String args[])
{
String string, sub;
int i, c, length;
Scanner in = new Scanner(System.in);
System.out.println("Enter a string to print it's all substrings");
string = in.nextLine();
length = string.length();
System.out.println("Substrings of \""+string+"\" are :-");
for( c = 0 ; c < length ; c++ )
{
for( i = 1 ; i <= length - c ; i++ )
{
sub = string.substring(c, c+i);
System.out.println(sub);
}
}
}
}
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