judge whether a number is an integer or not

[huan]

as title,
is there any function in C/C++ help me judge whether a number is an integer?
or is there any idea to write a function to complete this job?

[Banfa]

How is this number stored in memory?

Assuming that you are analysing a string then an integer consists of optionally a + or - as the first character followed by a string of digits. If anything other than a digit appears then it is not an integer.

[JosAH]

as title,
is there any function in C/C++ help me judge whether a number is an integer?
or is there any idea to write a function to complete this job?

Have a look at the modf() function; it breaks up a number into its fractional and
integer parts. If the fractional part equals zero the number logically is an integer.

kind regards,

Jos

[Ganon11]

Have a look at the modf() function; it breaks up a number into its fractional and
integer parts. If the fractional part equals zero the number logically is an integer.

kind regards,

Jos

Is it modf(), or fmod()?

EDIT: Wow, apparantly it's both.

[Banfa]

Is it modf(), or fmod()?

EDIT: Wow, apparantly it's both.

Read your links Ganon, those functions are not quite the same :D

[Ganon11]

I realize they're not the same, but both can work (in their own way) for this problem. I was just surprised that what I thought was a typo on Jos' part turned out to be a n actual function.

[huan]

Thanks a lots!! I got it~ :D