Differences between Structures in C and C ++

Differences between Structures in C and C ++

Let's understand this through an example:--

Structure in C language

structure in C

Here in above example ,we saw that how Structure define and call in C Language.

Structure in C++ language

structure in C++

Here , we seen that differences in structure define and calling C++ i.e 

1- we can not only initialize or call as  member variable in structure body( int bookid,char title,float price)but  function are also initialize or call as member function in structure body(void input(),void

display()).

2- In above example ,we can seen that input() function access directly bookid,title and price

     without any b1.bookid,b1.title,b1.price written as we seen in C language Structure and 

    at the time of input() function calling by  main () function it's directly call as b1.input() and 

    we can say that input function belong to b1 object.if we take another object like b2 and b2 call       input() function then we can say input() function belong to b2 as well .

3- we can secure and safe our data from corrupted in C++ Language.

How can we secure and protected our data from corrupted in C++ ?

C++ Language provides three access specifiers: Private , Public and Protected 

access specifiers in C++

In above example , we can seen that Private member i.e int bookid, char title , float price and rest of

member is Public member therefore we can access only public member outside of structure body i.e

higlighted portion i.e b1.bookid=-100 is not accessible to check this lets compile and check error in

below example--

Here is the error that 'book::bookid is not accessible' it's means bookid is private member and remember one that we use "if (bookid<0){bookid= -bookid;}" it's mean we want bookid number is

always positve whether user enter a negative number..

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