Sizes of Different Data Types :

How to Find Sizes of Data Types.
                                               
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Perform All Mathematical Operations :

             

Circumference of Circle :

The Formula use in 2*3.14*radius ( r ) .

User enter radius and display circumference of cicle.


        

Calculate Area of Circle :

Formula of area of circle = 3.14*r*r

User enter radius ( r ) and then the formula calculates area of circle. 

                

Use of cout and cin :

How to write program using cout and cin statements.

User enter age and then display it's age.