NESTING OF LOOPS in C language

NESTING OF LOOPS 

   When a loop inside another loop is used, it is called nesting of loops. The nesting can be for any number of levels. For certain problems, nesting of loops are needed. When nesting is done, some care is required. The outer loop should not end between the starting of inner loop and ending of inner loop.

 

·      Nesting For Loop

 

 For ( initialization-1; condition-1; increment/decrement )

{

         .

         .

         .

    For( initialization-2; condition-2; increment/decrement )

    {

               .

               .

               .

               Statement(s);

     }

}

Example :- 

for(i=0;i<=4;i++)
{
      for(j=0;j<=4:j++);
      {
             printf("*  ");
      }
       printf("\n);
}

In above example, First for loop is called as outer for loop, we set the control statement as ‘I’. and second for loop is called as inner for loop. And we set control statement for inner loop is ‘j’. nested loop is used in patterns that are shown in examples.

 

·      Nesting while loop

  

      Nested while loop is proceed as for loop.

 

While ( condition-1 )

{
       .

       .

       .

       While ( condition-2 )

       {

                .

                .

                .

                Statement (s);

        }

}

Example :-

while(i<=4)
{
      while(j<=4)
      {
             printf("*  ");
             j++;
      }
      printf("\n);
      i++;
}

 

·      Nested do…while Loop

 

    do

    {

                

                  do

                  {

 

                            Statement(s);

                   } while( condition );

     } (condition );

Example :- 

do
{
      do
      {
             printf("*  ");
             j++;
      }while(j<=4);
      printf("\n);
      i++;
}while(i<=4);