C++ string: Invalid pointer error

Question

I am getting an invalid pointer error when I call the below function. Why is this happening?

void Get(const char* value)
{
    string st(\"testing string\");
            


        

Answer 1

val variable inside Get() gets destroyed once Get() returns, thus the pointer to val body becomes invalid. Also value parameter is a copy of the original pointer, so the original val pointer in main() function is left unchanged and still holds a null pointer value.

Change it to

string Get()
{
    string st("testing string");
    string val = st.substr(1, st.length()); 
    return val;
}