Difference Between C and C++?

6 Answers

Rooster Cogburn Profile
Rooster Cogburn , Rooster Cogburn, answered

The major difference between C and C++ is that C is a procedural programming language and does not support classes and objects, while C++ is a combination of both procedural and object oriented programming language; therefore C++ can be called a hybrid language.

Rajat Dhande Profile
Rajat Dhande answered

C++ is Multi-Paradigm ( not pure OOP, supports both procedural and object oriented) while C follows procedural style programming.
  In C data security is less, but in C++ you can use modifiers for your class members to make it inaccessible from outside.
  C follows top-down approach ( solution is created in step by step manner, like each step is processed into details as we proceed ) but C++ follows a bottom-up approach ( where base elements are established first and are linked to make complex solutions ).
  C++ supports function overloading while C does not support it.
  C++ allows use of functions in structures, but C does not permit that.
  C++ supports reference variables ( two variables can point to same memory location ). C does not support this.
  C does not have a built in exception handling framework, though we can emulate it with other mechanism. C++ directly supports exception handling, which makes life of developer easy.

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Leesa Johnson Profile
Leesa Johnson answered

C is a procedural programming language and does not support classes and objects.

C++ is a combination of both procedural and object-oriented programming language. C++ can be called a hybrid language.

David Cornish Profile
David Cornish answered

C++ is much more than c with classes. There are many other concepts inside of C++ like templates, function & operator overloading, exceptions & many others already mentioned here. This makes C++ very powerful & flexible, but also hard to learn. It's not that the single concepts are difficult to understand, but the sum of them & how they are playing together. Take a look on boost to see what everything is possible to do with C++. And I guess it took ages to understand what happens under the hood, which is very clear in the case of C.

rohit kamalasanan Profile

C++ is Multi-Paradigm ( not pure OOP, supports both procedural and object oriented) while C follows procedural style programming.
  In C data security is less, but in C++ you can use modifiers for your class members to make it inaccessible from outside.
  C follows top-down approach ( solution is created in step by step manner, like each step is processed into details as we proceed ) but C++ follows a bottom-up approach ( where base elements are established first and are linked to make complex solutions ).
  C++ supports function overloading while C does not support it.


  C++ allows use of functions in structures, but C does not permit that.
  C++ supports reference variables ( two variables can point to same memory location ). C does not support this.
  C does not have a built in exception handling framework, though we can emulate it with other mechanism. C++ directly supports exception handling, which makes life of developer easy.
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Dheeraj Verma Profile
Dheeraj Verma , Dheeraj , answered

In C++, struct and class are exactly the same things, except for that struct defaults to public visibility and class defaults to private visibility.
Some important differences between the C and C++ structures:

  1. Member functions inside structure: Structures in C cannot have member functions inside structure but Structures in C++ can have member functions along with data members.
  2. Direct Initialization: We cannot directly initialize structure data members in C but we can do it in C++.

    • C
    • C++
    // C program to demonstrate that direct
    // member initialization is not possible in C
    #include <stdio.h>

    struct Record {
        int x = 7;
    };

    // Driver Program
    int main()
    {
        struct Record s;
        printf("%d", s.x);
        return 0;
    }
    /* Output :  Compiler Error
      6:8: Error: Expected ':', ', ', ';', '}' or
      '__attribute__' before '=' token
      int x = 7;
            ^
      In function 'main': */


    Output:

    7
  3. Using struct keyword: In C, we need to use struct to declare a struct variable. In C++, struct is not necessary. For example, let there be a structure for Record. In C, we must use “struct Record” for Record variables. In C++, we need not use struct and using ‘Record‘ only would work.
  4. Static Members: C structures cannot have static members but is allowed in C++.

    • C
    • C++
    // C program with structure static member
    struct Record {
        static int x;
    };

    // Driver program
    int main()
    {
        return 0;
    }
    /* 6:5: Error: Expected specifier-qualifier-list
      before 'static'
        static int x;
        ^*/


    This will generate an error in C but no error in C++.
  5. Constructor creation in structure: Structures in C cannot have constructor inside structure but Structures in C++ can have Constructor creation.

    • C
    • C++
    // C program to demonstrate that Constructor is not allowed
    #include <stdio.h>

    struct Student {
        int roll;
        Student(int x)
        {
            roll = x;
        }
    };

    // Driver Program
    int main()
    {
        struct Student s(2);
        printf("%d", s.x);
        return 0;
    }
    /* Output :  Compiler Error
      [Error] expected specifier-qualifier-list
        before 'Student'
      [Error] expected declaration specifiers or
      '...' before numeric constant
      [Error] 's' undeclared (first use
      5555555555in this function)
      In function 'main': */


    Output:2
  6. sizeof operator: This operator will generate 0 for an empty structure in C whereas 1 for an empty structure in C++.// C program to illustrate empty structure
    #include <stdio.h>

    // empty structure
    struct Record {
    };

    // Driver program
    int main()
    {
        struct Record s;
        printf("%dn", sizeof(s));
        return 0;
    }

    Output in C:



    0

    Output in C++:

    1
  7. Data Hiding: C structures do not allow concept of Data hiding but is permitted in C++ as C++ is an object oriented language whereas C is not.
  8. Access Modifiers: C structures do not have access modifiers as these modifiers are not supported by the language. C++ structures can have this concept as it is inbuilt in the language.

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