The class template `basic_string` provides many functional operations on strings, such as searching, sorting, copying, clearing, etc.  **`std::basic_string::capacity()`** is a member function of the `basic_string` class that gets the capacity of a given string.

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## What does `std::basic_string::capacity()` do?
`std::basic_string::capacity()` returns the number of characters that a string can store, meaning it returns the storage capacity of strings. The exact capacity of a string depends on the implementation. 
The capacity can be greater than or equal to the string's length.








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## Header
This function requires the following header file:
```c++
#include <string>
```
## Syntax
```
string.capacity();
```
## Code

#include <iostream>
#include <string>
using namespace std;

void print(string str){
  cout<<str<<endl;
  cout<<"The length of string is:"<<str.length()<<endl;
  cout<<"The capacity of string is:"<<str.capacity()<<endl;
}

int main() {

  string str("Happy Learning");
  print(str);
  string empty("");
  print(empty);
  //increase length of str
  str+=" at educative";
  print(str);
  return 0;
}

#     
## Max size
The maximum size is another property associated with strings. The maximum size dictates the largest possible size a string can have, and if the value is exceeded, the compiler throws a length error exception. The max size depends on the operating system and architecture design.

#include <iostream>
#include <string>
using namespace std;


int main() {

  string str("Edpresso");
  cout<<str.max_size()<<endl;
  cout<<str.capacity()<<endl;
  cout<<str.length()<<endl;
  return 0;
}

What is std::basic_string::capacity in C/C++?

The class template basic_string provides many functional operations on strings, such as searching, sorting, copying, clearing, etc.  std::basic_string::capacity() is a member function of the basic_string class that gets the capacity of a given string.  What does std::basic_string::capacity() do? std::basic_string::capacity() returns the number of characters that a string can store, meaning it returns the storage capacity of strings. The exact capacity of a string depends on the implementation. The capacity can be greater than or equal to the string s length. 