Why can't my project define a .h file I wrote?

shishen532

I have 4 .cpp files in my project.
I wrote #include "xxxx.h" files in 4 .cpp files.
Why did something go wrong. What's in..obj or something.

It is normal to delete 3 .cpp files. But I need to call this .h file in 4 windows. What is the reason?

xietao405

Is there in the header file
#ifndef #define #endif

sevenbox

Include it repeatedly.
If one .h already contains the other three
Just write this one