How to Append a '.txt' Extension to a String in C ?

Concatenating Strings in C

Question:

In C , I have a private class variable char name[10], and I need to append the .txt extension to it to open a file with that name in the current directory. How can I achieve this while creating a new string variable that holds the concatenated result?

Answer:

To concatenate strings in C , the preferred approach is to use the std::string class instead of raw pointers like char* or arrays. Here's how you can use std::string to concatenate your strings:

#include <string>
using namespace std;

class MyClass {
private:
    string name;

public:
    MyClass(const char* name) : name(name) {}

    void concatenate() {
        string new_name = name + ".txt";
        // Do something with new_name
    }
};

Now, you can create an instance of MyClass, set the name variable, and then call the concatenate() method to add the .txt extension:

int main() {
    MyClass myClass("myfile");
    myClass.concatenate();
}

By using std::string, you can easily concatenate strings with the operator, and it automatically manages memory allocation and deallocation. Additionally, you have access to a wide range of member functions that allow for further string manipulation. For more information, refer to the documentation of std::string linked below:

• [Documentation of std::string](https://en.cppreference.com/w/cpp/string/basic_string)

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