Java Loops Programs

 1. Write a Program to print the following Pattern--

****
***
**
*

Program: 

// Akash Suryawanshi
// 25-Nov-2022
public class loops {
    public static void main(String[] args) {
        int n = 4;
        for(int i=n;i>0;i--){
            for(int j=0;j<i;j++){
                System.out.print("*");

            }
            System.out.print("\n");
        }
    }

       }

Output: 

****
***
**
*

 2. Write a program to sum first n even numbers using a while loop.

Program:

// Akash Suryawanshi
// 25-Nov-2022
public class loops {
    public static void main(String[] args) {
        int sum = 0;
        int n = 5;
        for (int i = 0; i < n; i++) {
            sum = sum+(2*i);
        }
        System.out.println("Sum of even number: " +sum);

    }
}

Output:
Sum of even number: 20

 3. Write a program to print the multiplication table of a given number n.

Program:

// Akash Suryawanshi
// 25-Nov-2022
public class loops {
    public static void main(String[] args) {
        int n = 5;
        for(int i=1;i<=10;i++){
            System.out.printf("%d X %d = %d\n" ,n,i ,n*i );
        }

    }
}

Output:

5 X 1 = 5
5 X 2 = 10
5 X 3 = 15
5 X 4 = 20
5 X 5 = 25
5 X 6 = 30
5 X 7 = 35
5 X 8 = 40
5 X 9 = 45
5 X 10 = 50

 4. Write a program to find the factorial of a given number using for loop 


Program:

// Akash Suryawanshi
// 25-Nov-2022
public class loops {
    public static void main(String[] args) {
        int n = 5;
        int factorial=1;
        for(int i = 1;i<=n;i++){
            factorial *=i;

        }
        System.out.println("Factorial of a given number is: " +factorial);
    }
}

Output:
Factorial of a given number is: 120


5.  Write a program Display sum of n Natural Numbers.

Program:

// Akash Suryawanshi
// 25-Nov-2022
public class loops {
    public static void main(String[] args) {
        int sum= 0;
        int n = 10;
        int i;
        for(i = 1; i<=n;i++){
            sum += i;
        }
        System.out.println("Sum of natural numbers is: "+sum);
    }
}

Output:
Sum of natural numbers is: 55

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