if-else statement.....

                                                            CORE JAVA 


1.Write a program to check if a number is positive or negative.

    Program:

    import java.util.Scanner;

    public class q1 {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);


        System.out.print("Enter a number: ");

        double g= scanner.nextDouble(); 

        if (g> 0) {

            System.out.println("The g is positive.");

        } else if (g < 0) {

            System.out.println("The g is negative.");

        } else {

            System.out.println("The g is zero.");

        }

        scanner.close();

        }

        }

    Output:


2.Write a program to check if a number is even or odd.

    Program:
    
    public class q2 {
    public static void main (String[] args) {
    int number=77;
    if(number%2==0){
        System.out.println("Number is even");
    }else if(number%2==1){
        System.out.println("Number is odd");
    }else{
        System.out.println("Number is not zero");
    }
    }
    }

    Output:





3.Write a program to find the largest of three numbers.

 Program:
    
    import java.util.Scanner;
    public class q3{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter 3 numbers: ");
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int largest;
        if (a >= b && a >= c) {
            largest = a;
        } else if (b >= a && b >= c) {
            largest = b;
        } else {
            largest = c;
        }
        System.out.println("Largest number is: " + largest);
        sc.close();
    }
}

Output:

4.Write a program to check if a number is divisible by 5.

Program:
    
    class q4 {
    public static void main(String[]args) {
        int number=20;
        if(number%5==0){
            System.out.println("Num = "+number + " is divisible by 5");
        }
        else{
            System.out.println("Num = "+number + " is not divisible by 5");
        }

    }
}

Output:

5.Write a program to check if a number is divisible by 3 and 5.

Program:
    
    class q5 {
    public static void main(String[] args) {
        int a=15;
        if(a%3==0 && a%5==0) {
            System.out.println("a="+a + "is divisible by 3");
        }
        else{
        System.out.println("a is not divisible by 3,5");
        }
    }
}

Output:
6.Write a program to check if a person is eligible to vote (age ≥ 18).

    Program:

    import java.util.Scanner;
class age {
    public static void main(String[] args) {
 Scanner sc = new Scanner(System.in);
 int age;
 System.out.println("Enter your age");
 age=sc.nextInt();
 if(age>=18){
    System.out.println("Person is eligible vote.");
 }else{
    System.out.println("Person is not eligible vote.");
 }
 sc.close();
    }

}

Output:
7.Write a program to check if a number is three-digit number.

    Program:

    import java.util.Scanner;
    class threedigit{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int number;
        System.out.println("Enter a number:");
        number=sc.nextInt();
        if(number>=100 && number<999){
            System.out.println("Number = " +number + " is a three digit number");
        }
            else{
                System.out.println("Number = " +number + " is not a three digit number");
            }
            sc.close();
            }
        }

    Output:
8.Write a program to check if two numbers are equal or not.

    Program:
    
    class equals {
    public static void main(String[] args) {
        int a=10, b=20, c=10;
        System.out.println(" a="+a +"\n b="+b +"\n c="+c);
        if(a==b && b==c){
            System.out.println("a and b is equal");
        }else if(a==c ){
            System.out.println("a and c is equal");
        }
        else{
            System.out.println("a and c is not equal");
        }
        }
    }

    Output:

9.Write a program to display grade (A/B/C/F) based on marks.

Program:

    import java.util.Scanner;
    class grade {
    public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    int marks,grade;
    System.out.println("Enter the marks:");
    marks=sc.nextInt();
        if(marks>=90 && marks < 100){
            System.out.println("Grage: A");
        }
        else if(marks>=65 && marks<90){
            System.out.println("Grade: B");
        }
        else if(marks>=35 && marks<65){
            System.out.println("Grade: C");
        }
        else if(marks>0 && marks<35){
            System.out.println("Grade: Fail");
        }
        else{
            System.out.println("Invaild marks");
        }
        sc.close();
    }
}

    Output:

10.Write a program to check if a year is a leap year or not.
 
    Program:

    import java.util.Scanner;
    class q10 {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int year;
        System.out.println("Enter a year:");
        year=sc.nextInt();
        if(year%4==0){
            System.out.println("It is  leap year");
        }
        else{
            System.out.println("It is not a leap year");
        }
    }
}

Output:

11.Write a program to find the smallest of two numbers.

    Program:

    import java.util.Scanner;
    class smallest2 {
    public static void main (String[] args) {
        Scanner sc=new Scanner(System.in);
        int a,b;
        System.out.println("Enter a number a:");
        a=sc.nextInt();
        System.out.println("Enter a number b:");
        b=sc.nextInt();
        if(a<b){
            System.out.println("a is small");
        }
        else{
            System.out.println("b is small");
        }
        sc.close();
    }
}

    Output:
12.Write a program to find the smallest of three numbers.

    Program:

    import java.util.Scanner;
    class q12 {
    public static void main (String[] args){
        Scanner sc=new Scanner(System.in);
     int a,b,c;
     System.out.println("Enter the number a:");
     a=sc.nextInt();
     System.out.println("Enter the number b:");
     b=sc.nextInt();
     System.out.println("Enter the number c:");
     c=sc.nextInt();
     if(a<=b && a<=c){
        System.out.println("a is small");
     }else if(b<=a && b<=c){
        
        System.out.println("b is small");
     }
     else{
        System.out.println("c is small");
     }
    }
}

Output:

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