'new char[]' does not work, but it should

Question

I had the code, that returned char* If a write in cpp:

char* test_char = new char[size];

all is good, but if i write in header:

char* test_char;

and in cpp:

test_char = new char[size];

the program compiles but does not run.

What am I doing wrong?

Answer 1

char = new char[size];

You probably want

test_char = new char[size];

Answer 2

char = new char[size];

This should not even compile. You are missing a variable name:

test_char = new char[size];