What are the purpose of each in c++?
if statements?
switch statements?
multiway if?
nested loops?
rand?
srand?
seed?

If statements- This statement is used to check the condition.

    if(condition)

      {

        statement

     }

If the condition is true,then statement will run,else not.

Switch statement-This statement is used for long conditions.It is a substitute for if,else conditions

     switch(a)

       {

          case1: statement 1//if a=1

                      break;

          case2: statement 2 //if a=2

                       break;

          default:statement//if a is not equal to any of the cases.

Multiway if-In this statement ,if elseif and else were there.

    if(condition1)

       {

         statement 1

       }

   elseif(condition2)

       {

         statement 2

      }

   else

       {

         statement n

       }

Nested loops-This statements are used when we use if-else conditions in other if,else conditions.

   if(condition 1)

     {

       if(condition 2)

          {

           if (condition 3)

              {

               statement 3

              }

          else

               {

                 statement 4

               }

           }

      ]

rand()-This method is used for generating random number.The expression is

     number=rand()%50;

It will generate a random number ranges between  0 to 50.

srand()-This method is used to set the starting value for random number series.

srand (time(NULL));

seed()-It is a method for initializing the same random series,it is passed in srand().

they really not common the os x is just a better version of the os like in iphone theirs xr and their xs