How to run a C++ code in Qt?

[Rela]

Hi, the previous error was solved. I wanted to have a C++ code results in widget. For reminding in brief, I created a Qt widget project, and I added the C++ code including header and source files to the project. I copied the main.cpp C++ codes in the Qt main.cpp file.

The error was ```

void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *

I changed the definition of the function:

void PS... (char *_sth)

to

void PS... (const char *_sth) 

and it doesn't give the error. But, now I want to have some values as result in Application Output , but instead of the non-zero values, they are all zero.
The input data are read from a model.txt file. The path of the text file was also added in the "project" > run of "Desktop Qt 5.6 MSVC2015 64 bit" > "Arguments". Do you know if it is related to the reading input data or not?

[jsulm]

How do you read model.txt file?
Is this file found?
Do you have any errors while reading it?
Why don't just debug and see what happens?

[Rela]

@jsulm
In the code, it read using ```

bool ReadModelData(istream &in, functionname &_PS) ...
...
ReadModelData (fin,s)
...

The path of the text file was added in the "project" > run of "Desktop Qt 5.6 MSVC2015 64 bit" > "Arguments". File path
When I debug it just show in the Application output:

Debugging starts
Debugging has finished

and when run the code the results are cpu=0 z=0 ... while they should be some non-zero.