isctype.c assert

[chen01701]

Hi,

We got a n assert in our application program: Debug Assertion Failed! File: isctype.c Line: 68 Expression (unsigned) (c+1) <=256

Can someone explain the cause of the assertion? Is it caused by user program, or caused by C library internal? How to avoid this problem?

Thanks

Jun

[MMcCarthy]

You have posted this in the Articles section. I am moving it to the C++ / C forum.

ADMIN

[Banfa]

We got a n assert in our application program: Debug Assertion Failed! File: isctype.c Line: 68 Expression (unsigned) (c+1) <=256

Can someone explain the cause of the assertion? Is it caused by user program, or caused by C library internal? How to avoid this problem?

Almost certainly a program error, the message is telling you the expression that was false and caused the assert so

((unsigned) (c+1) <=256) == false

causing an assertion. Most likely you have passed a value to one of is is<type> (isdigit for example) that is outside the valid range for a char.