case control structure in c

C provides a special control statement that allows us to handle such cases effectively rather than using a series of 'if' statements.
     
Decision using Switch:

the control statement that allows us to make a decision from the number of choices is called a 'switch' or more correctly a 'swicth' case default. since these three keywords go together to make a 'Control Statement'. The most of them appears as follows:

switch(Expression)
{
        case <constant 1> :
                     do this;
              break;
         case<constant 2> :
                    do this;
              break;
        case<constant n> :
                   do this;
              break;
       default:
            do this;
}

The expression following keyword switch is any 'C' expression that will yield on together value. It could be an integer constant like 1,2,3, or an expression. The keyword case is followed by an integer or character constant. Each constant in each case must be different from all other the "do this" in above form of 'switch' represents any valid 'C' statements.