when i try to coupling two projects,i find it.I use vs2019+ivf .But it's strange that the word can be run in old project,after i coupling,the error come out .
You didn't tell us with what compiler the old project accepted the code, but FLOAT is not a standard function. You are looking for REAL. It may have been some legacy function in the other compiler. Or perhaps the new project includes options for a stricter check on the standard?