i have get error heap error using constructor ( use memory dinamic char *t = new char [10] t ="test123456";) and in distructor delete [] t; error

Question

error heap memory, memory corruption, #181 just don't understand it. Some time try use copy ctor and it the same error. Can You explain me

Test::Test() {
    desc = new char[4];`
    desc = "Try";
} 

Test::~Test() {delete [] desc; }

Answer 1

It fails because you do not understand basics of C++.

desc = new char[4]; desc = "Try";

This line of code first allocates memory for 4 characters, returns the pointer to allocated memory and stores it in desc . However, the next moment you completely lose this pointer, and now assign "Try" (a string literal) to desc . Now your desc points to "Try".

Here

Test::~Test() {delete [] desc; }

you delete the pointer, which points to "Try" - as if you would do delete "Try" . But you can't delete a string literal, you did not create a it.

Hence the crash.