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Difference between C structures and C++ structures�

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1. Member functions inside structure

  • Structures in C cannot have member functions inside structure

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  • but Structures in C++ can have member functions along with data members.

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2. Direct Initialization: �We cannot directly initialize structure data members in C but we can do it in C++.�

  • Code in C++
  • #include <iostream>
  • using namespace std;
  •   
  • struct Record {
  •     int x = 7;
  • };
  •   
  • // Driver Program
  • int main()
  • {
  •     Record s;
  •     cout << s.x << endl;
  •     return 0;
  • }

​

​

​

​

​

  • Code in C

​

​

  • struct Record {
  •     int x = 7;
  • };
  •   
  • int main()
  • {
  •     struct Record s;
  •     printf("%d", s.x);
  •     return 0;
  • }

​

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3. Using struct keyword

  • In C, we need to use struct to declare a struct variable.

​

​

  • In C++, struct is not necessary.

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4. Static Members

  • C structures cannot have static members but is allowed in C++.
  • // C program with structure static member
  • struct Record {
  •     static int x;
  • };

​

​

  • int main()
  • {
  •     return 0;
  • }
  • This will generate an error in C but no error in C++.

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5. Constructor creation in structure

  • Structures in C cannot have constructor inside structure

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  • but Structures in C++ can have Constructor creation.

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                  • PTO

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

​

  • struct Student {
  •     int roll;
  •     Student(int x)
  •     {
  •         roll = x;
  •     }
  • };
  •   
  • int main()
  • {
  •     struct Student s(2);
  •     printf("%d", s.x);
  •     return 0;
  • }
  • /* Output :  Compiler Error

​

  • // CPP program to initialize data member in c++
  • #include <iostream>
  • using namespace std;
  •   
  • struct Student {
  •     int roll;
  •     Student(int x)
  •     {
  •         roll = x;
  •     }
  • };
  •   
  • // Driver Program
  • int main()
  • {
  •     struct Student s(2);
  •     cout << s.roll;
  •     return 0;
  • }
  • // Output
  • // 2

​

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6. Data Hiding

  • C structures do not allow concept of Data hiding .

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  • but is permitted in C++ as C++ is an object oriented language whereas C is not.

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7. Access Modifiers

  • C structures do not have access modifiers as these modifiers are not supported by the language.

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  • C++ structures can have this concept as it is inbuilt in the language.