std::string::clear in C++

The string content is set to an empty string, erasing any previous content and thus leaving its size at 0 characters.
Parameters: none
Return Value: none

void string ::clear ()
- Removes all characters (makes string empty)
- Doesn't throw any error
- Receives no parameters and returns nothing

// CPP code to illustrate
// clear() function

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

// Function to demo clear()
void clearDemo(string str)
{
    // Deletes all characters in string
    str.clear();

    cout << "After clear : ";
    cout << str;
}

// Driver code
int main()
{
    string str("Hello World!");

    cout << "Before clear : ";
    cout << str << endl;
    clearDemo(str);

    return 0;
}

Output:

Before clear : Hello World!
After clear : 

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