Frequently Asked Programming Interview Questions and Answers

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Frequently Asked Programming Interview Questions and Answers

=== Write a profram to read a number and display its no.of digits in it ==== 

package sample.programs;

import java.util.Scanner;

public class Lab1 {
public static void main(String[] args) {
Scanner sc =new Scanner(System.in);
System.out.println("Enter the number:");
int a =sc.nextInt();
System.out.println("Number is:"+a);

String str =String.valueOf(a);
System.out.println("No.of digits :"+str.length());

}
}

=== Write a program to read a number and display its factorial ===

package sample.programs;

public class Lab3 {
public static void main(String[] args) {
Hello h = new Hello();
long b= h.Factorial(5);
System.out.println(b);
}
}
class Hello{
public long Factorial(int a){
if(a==0)
return 1;
else
return a*Factorial(a-1);
}}


==== write a program to read number and display its fibonacci series and Nth fibonacci series number==

package sample.programs;

public class Lab5 {
public static void main(String[] args) {
int a=5;
int arr[] = new int[a];

for (int i = 2; i < arr.length; i++) {
arr[0]=0;
arr[1]=1;
arr[i]=arr[i-1]+arr[i-2];
}
for (int i = 0; i < arr.length; i++) {
System.out.println(arr[i]);
}
System.out.println("Nth fibonacci number:"+arr[a-1]);
}
}


=== Write a program to read number and display its individual sum ===

package sample.programs;

public class Lab4 {
public static void main(String[] args) {
int n = 1234;int rem,sum=0;
while(n!=0){
rem=n%10;
sum=sum+rem;
n=n/10;
}
System.out.println(sum);
}
}

=== Write a program to read a number to display it==

package sample.programs;

public class Lab6 {
public static void main(String[] args) {
int i = 235;
String str = String.valueOf(i);
int a=str.length();
System.out.println("Given number :");
for (int j = 0; j < str.length(); j++) {
System.out.println(str.charAt(j));
}
System.out.println("Reverse of given number:");
for (int k =str.length()-1 ; k >=0; k--) {
System.out.println(str.charAt(k));

}

}
}

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