/* Question - 04

Java Program To Find Given Number Is Armstrong Number Or Not

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num,Rem,Sum=0,Var;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Number :");

Num = s.nextInt();

Var = Num;

while(Num!=0) {

Rem = Num%10;

Sum = Sum+Rem*Rem*Rem;

Num = Num/10;
}

if(Sum==Var)
{
System.out.println(Var+" Is A Armstrong Number");
}

else
{
System.out.println(Var+" Is Not A Armstrong Number");
}
}
}

/* Question - 05

Java Program To Find The Sum Of Digits Of A Given Number

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num,Rem,Sum=0;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Number :");

Num = s.nextInt();

while(Num!=0) {

Rem = Num%10;

Sum = Sum+Rem;

Num = Num/10;
}

System.out.println("Sum Of Digits Of A Number :"+Sum);
}
}

/* Question - 07

Java Program To Find Whether The Given Number Is Prefect Number Or Not

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num,Count=0,Sum=0,Var;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Number :");

Num = s.nextInt();

Var = Num;

for(int i=1;i<Num;i++)
{
if(Num%i==0)
{
Sum = Sum + i;
}
}

if(Sum==Var)
{
System.out.println(Num+" Is A Perfect Number");
}

else
{
System.out.println(Num+" Is Not A Perfect Number");
}
}
}

/* Question - 06

Java Program To Find Quadratic Equations

*/

package ABC;

import java.lang.Math;

import java.util.*;

public class Main {

public static void main(String[] args) {

double A,B,C;

double P,Q;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Value Of A :");

A = s.nextDouble();

System.out.print("Enter The Value Of B :");

B = s.nextDouble();

System.out.print("Enter The Value Of C :");

C = s.nextDouble();

double discrement = B*B-4*A*C;

if(discrement>0)
{
P = ((-B+Math.sqrt(discrement))/2*A);

Q = ((-B-Math.sqrt(discrement))/2*A);

System.out.printf("The Quadratic Equations Are P:"+P+" Q:"+Q);
}

else if (discrement == 0.0)
{
double r1 = -B / (2.0 * A);

System.out.println("The root is " + r1);
}
else
{
System.out.println("Roots are not real.");
}
}

}

Next in our basic java series
Conditional Statements
https://youtu.be/tbuCA5eM_LM

Next in our written exam solution series
Sherlock number this was asked in Mindtree 21st and 22nd Feb

https://youtu.be/H-COtpDvupo

/* Question - 19

Java Program To Find Fibonacci Series

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num1=0,Num2=1,Num3,Total_Num;

Scanner S = new Scanner(System.in);

System.out.print("Fibonacci Series Upto :");

Total_Num = S.nextInt();

for(int i=1;i<=Total_Num;++i)
{
System.out.print(Num1+",");

// Printing The Next Terms

Num3 = Num1 + Num2;

Num1 = Num2;

Num2 = Num3;

}
}
}

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/* Question - 15

🚨 Interview Important Question 🚨

Java Program Swapping Of Two Numbers Without Using Third Variable

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num1,Num2;

Scanner S = new Scanner(System.in);

System.out.println("Enter Value Num1:");

Num1 = S.nextInt();

System.out.println("Enter Value Num2:");

Num2 = S.nextInt();

// Condition

Num1 = Num1 + Num2;

Num2 = Num1 - Num2;

Num1 = Num1 - Num2;

// After Swapping

System.out.printf("Value Of Num1,Num2 Are :%d %d",Num1,Num2);

}
}