loops in Java

   while loop 

package com.company;

public class whileloop {
    public static void main(String[] args) {
        int a =5;
        int i=0;
        while (i<=a)
        {
            System.out.println(i);
            i++;
        }
    }

}

do-while loop

package com.company;

public class do_while {
    public static void main(String[] args) {
        int a=5;
        int i=6;
        do {
            System.out.println(i);
            i++;
        }
        while(i<a);
    }
}

for loop

package com.company;

public class for_loop {
    public static void main(String[] args) {
        int a=100;

        for (int i=0; i<=a; i++)
        {
            int b=i%2;
            System.out.println(2*i+1);
           // if (b != 0){
//
           // System.out.println(i);
           }
    }
}

for-each loop

package com.company;

public class for_eachLOOP {
    public static void main(String[] args) {
        int []s = {34,65,67,2,67,89};
        int s1=0;
        for(int v:s)
        {
            s1= s1+v;

        }
        System.out.println(s1);
    }
}

factorial using for loop

package com.company;

public class factorial {
    public static void main(String[] args) {
        int a= 5;
        double m=1;
        for(int i=1; i<=a; i++)
        {
            m=m*i;
            System.out.println(m);
        }
        System.out.println(m);
    }
}

multiplication table using for loop

package com.company;
import java.util.Scanner;
public class multiplicationtable {
    public static void main(String[] args) {
        Scanner s= new Scanner(System.in);
        System.out.println("enter a number to print table");
        int n =s.nextInt();
        for(int i=0; i<=10; i++)
        { int m=n*i;
            System.out.printf("\n %d * %d = %d",n,i,m);
        }
         for(int i=10; i>0; i--)
        {
         int m=n*i;
         System.out.printf("\n %d * %d = %d",n,i,m);
         }
        int s1=0;
        for(int i=0; i<=10; i++)
        {
           s1=s1+n*i;

          }
        System.out.printf("\n sum of all the multiples in %d's Table is: %d",n,s1);
    }

}

reverse triangle using for loop

package com.company;

public class reversetriangle {
    public static void main(String[] args) {
        int a=5;
        for (int i=a; i>=0; i--)
        {
            System.out.println("\n");
            for(int j=i;j>=0;j--)
            System.out.print("\t *");
        }
    }

}

sum of  n even numbers using for loop

package com.company;
import java.util.Scanner;
public class sumNevennumbers {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("enter the number of natural numbers you want to add");
        int n =sc.nextInt();
        double sum=0;
        for(int i=0; i<=n; i++)
        {
            {
                sum=sum+2*i;
            }

        }
        System.out.printf("addition is %f", sum);
    }
}

program to print fibonacci series using for loop

 package com.company;

public class fibonacci_series {
    public static void main(String[] args) {
        int a=0;
        int b=1;
        int c=0;
        for(int i=1;i<10 ;i++)
        {
            c=a+b;
            a=b;
            b=c;
        }
        System.out.println(b);
    }
}