Visual C++ "Debug Assertion Failed"

Question

I had compiled a code using Visual Studio 2010, then I tried to run it, unfortunately during testing sometimes I had errors "Debug Assertion Failed!"....Expression (unsingned)(c+1)<=256

Then I tried the same scenario but using gcc and it ran without any problem. any idea how about this problem?

Answer 1

You're calling a function like isalpha() or isdigit() with an integer whose value is not a single byte 0-255.