C++ Compare string ? == operator not working

You have probably got control characters in one of your strings. Try cleaning them up by doing something this.

string MyWebResponse = "5accdd72bb566079faf459cbad0934c5";
string cleanedResponse=  new string(MyWebResponse.Where(c=>!char.IsControl(c)).ToArray());

Try strcmp instead.

Please see:
http://www.cplusplus.com/reference/string/string/compare[^].

—SA

A few things to consider before actually answering the question. First of all, I hope you are aware that string is not an actual type, it is just a representation of array of characters. In high-level programming you are not shown what the data is like underground, so these types of "string" or other similar come into action. But each of the framework has built-in functions to find out more.

Now the code that you've shown, is more like C# type (client.GetResponse()? That is more like an object from C# being called there; based on the naming convention, may be wrong). But, in C++ a string can be compared to another string using == operator. What happens is that the strings are compared using std::compare[^] to determine whether both are same or not and returns a value indicating true or false. (String is not an actual type!)

Your code, I have tested and works just perfect. I tried the following code,

#include <iostream>
#include <string>

int main()
{
    std::string webresponse = "5accdd72bb566079faf459cbad0934c5";
    std::string secondStr = "5accdd72bb566079faf459cbad0934c5";

    if(webresponse == "5accdd72bb566079faf459cbad0934c5" && 
       webresponse == secondStr) { // In case you think variable may cause a trouble
        std::cout << "Equal";
    } else {
        std::cout << "Not equal";
    }
    
    return 0;
}

// Output:
// Equal

You can test it right here, http://cpp.sh/8rdi[^]

Now the thing that I wanted to point out is that are you sure it doesn't work? I am sure C# would also work in the same way if that is a C# snippet. However, the answer is inpired by PIEBALDconsult's comment to your question, the actual answer is what he wrote there. :-)