27-12-24
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Q)When to use "if else" statement.
=>Whenever two mutually exclusive conditions are to be tested
we should go for "if else" statement.
    For eg.   finding if a number is even or odd
Q)Java application to find if a number is even or odd.
//evenodd.java
import java.util.Scanner;
class EvenOdd{
   public static void main(String a[]){
       Scanner scanner=new Scanner(System.in);
       System.out.print("Enter the number:");
       int n=scanner.nextInt();	//8
       if(n%2==0){
           System.out.println("It is an even number");
       }
       else{
           System.out.println("It is an odd number");	
       }
   }
}
Q)When to use if else ladder statement?
=>Whenever more than 2 mutually exclusive  conditions are to 
be verified, we go for "if else ladder".

Syntax
--------
if(condition)
{
   //statements
}
else if(condition)
{
   //statements
}
else if(condition)
{
   //perfrom the task
}
else
{
    //task perfroming code
}

Q)Java application to find if a number is +ve or -ve.
//positivenegative.java
import java.util.Scanner;
class PositveNegative{
   public static void main(String args[]){
       Scanner scanner=new Scanner(System.in);
	   System.out.print("Enter the number:");//0
	   int n=scanner.nextInt();
           if(n>0){
		 System.out.println("It is +ve");
	   }
	   else if(n<0){
                  System.out.println("It is -ve");
	   }
	   else{
                 System.out.println("It is ZERO");
	   }
   }
}
Q)When to use nested if statement in a Java application?
   =>Writing an if statement within the body of another if statement is
   nothing but a nested if.
       if(condition){ //outer if
           if(cindition){  //nested if OR inner if
	   }
       }
  =>Whenever more than one level of condition checking is the
  requirement, we go for nested if statement.
Q)Java application to find if a number is +ve even,+ve odd,-ve even
OR -ve odd.

//positiveevenodd.java
import java.util.Scanner;
class PositveEvenOdd{
   public static void main(String args[]){
       Scanner scanner=new Scanner(System.in);
	   System.out.print("Enter the number:");
	   int n=scanner.nextInt();
       if(n>0){
		   if(n%2==0){
		       System.out.println("It is +ve even");
	          }
		   else{
			   System.out.println("It is +ve odd");
		   }
       }
       else {
                  if(n%2==0){
		       System.out.println("It is -ve even");
	          }
		   else{
			   System.out.println("It is -ve odd");
		   }
        }
   }
}

Q)Develop a Java application to display a digit in word.
//digit.java
import java.util.Scanner;
class Digit{
   public static void main(String args[]){
       Scanner scanner=new Scanner(System.in);
	   System.out.print("Enter a digit(0-9):");
	   int digit=scanner.nextInt();
       if(digit==0){
		   System.out.println("ZERO");
       }
	   else if (digit==1){
          System.out.println("ONE");
	   }
	   else if (digit==2){
          System.out.println("TWO");
	   }
	   else if (digit==3){
          System.out.println("THREE");
	   }
	   else if (digit==4){
          System.out.println("FOUR");
	   }
	   else if (digit==5){
          System.out.println("FIVE");
	   }
	   else if (digit==6){
          System.out.println("SIX");
	   }
	   else if (digit==7){
          System.out.println("SEVEN");
	   }
	   else if (digit==8){
          System.out.println("EIGHT");
	   }
	   else if (digit==9){
          System.out.println("NINE");
	   }
	   else{
		   System.out.println("Invalid input.Please enter digit only");
	   }
   }
}
Note:- There are two multi way branching statements in Java.
       1)if else  ladder statement
       2)switch  statement

//digit.java
import java.util.Scanner;
class Digit{
   public static void main(String args[]){
       Scanner scanner=new Scanner(System.in);
	   System.out.print("Enter a digit(0-9):");
	   int digit=scanner.nextInt();
       switch(digit){
              case 0: System.out.println("ZERO");
			              break;
              case 1: System.out.println("ONE");
			              break;
              case 2: System.out.println("TWO");
			              break;
              case 3: System.out.println("THREE");
			              break;
              case 4: System.out.println("FOUR");
			              break;
              case 5: System.out.println("FIVE");
			              break;
              case 6: System.out.println("SIX");
			              break;
              case 7: System.out.println("SEVEN");
			              break;
              case 8: System.out.println("EIGHT");
			              break;
              case 9: System.out.println("NINE");
			              break;
              default:  System.out.println("Please enter digit only");           
 	   }//switch	   
       
   }
}