LOOPs

LOOPs

1.) for loop

2.) while loop

3.) do while loop

FIRSTLY WE ARE GOING TO TALK ABOUT FOR LOOP 

In programming language FOR loop is used to allow code executed repeatedly. For loop is useful when you know how many times a task to be repeatedly.

example :-

       

                 for(exp1; exp2; exp3)

                      {

                         statements;

                      }

where : 

    

     exp1 :- initialization expression 

     exp2 :- test expression

     exp3 :- update expression.

EXAMPLE FOR CHECK WEATHER NUMBER IS PRIME OR NOT

 class prime 

{

 public static void main(string args[]){

int n = Integer.parseInt(args[0]);

boolean flag = true;

for(int i=2; i<n/2; i++)

 {

   if(n%i==0)

    {

      d=i;

      flag = false

      break;

     }

  }

if(flag)

system.out.println("number is prime");

else

system.out.println("number is not prime");

  }

}

NESTED LOOP

The placing of one loop inside the body of another loop is called nesting. The most common nested loop are for loop.

Example of nested loop a table up to n numbers :-

class table
{
 public static void main(string args[]){

for(int i=1; i<=10; i++)
  {
    for(int j=1; j<=10; j++)
    {
      system.out.println(i + "" + j);
    }
  }
}

WHILE LOOP

In programming language WHILE loop is used to control flow statement that allow code to repeatedly executed based on the condition.


example :-

              while(condition)
                   {
                    statements
                    ________
                     ________
                    }

Example for sum of digits

class digitSum

{
  public static void main(string args[]){

  int n = Integer.parseInt(args[0]);
  int r,s = 0;
  while (n!=0)
    {
      r = n%10;
      s = s+r;

      n = n/10;
    }
system.out.println("sum of digits="+s);

 }
}

DO WHILE LOOP

In programming language DO WHILE loop is used to control flow statement that executes a part of code single time and then repeatedly executes the part of code, its depend on the giving condition in the program. 

example:-

        do
            {
              statements;
                _______
                _______
             }
         while(condition)


Example to print number from 1 to 19


class example
{
 public static void main(string args[]){

int x= 1;

do
  {
    system.out.println("x is :=" +x);
    x++;
   system.out.println("/n");
   }
 while(x=<20);
 }
}