Question

How can I convert a string in to char * I was using the following method, but it doesn’t work.

At runtime it gives me the following error:

Run-Time Check Failure #3 – The variable ‘url’ is being used without
being initialized.

eventhough I have initialized it as shown in the code bellow. Can you please show me with an example?

    char* url;
    sup = "news"
    sup="http://www."+sup+"yahoo.com";
    strcpy(url, sup.c_str());

I am using Microsoft Visual Studio 2010, C++ in console

Answer 1

strcpy doesn’t allocate memory for you, you must do it yourself, remembering to leave space for the null termination character:

char* url = new char[sup.length()+1];

or

char url[sup.length()+1];
//...
strcpy(url, sup.c_str());

In the first case, don’t forget to delete[] the array. The second case will only work if your compiler supports C99 variable-length arrays as an extension.