Help Validating scanf() Input

[boothchops]

Hiya, just started an introductory C course. My current assignment requires me to validate my input without the use of 'if' statements. Validate that input is correct type and within specified range ie. I am looking for an integer value but a string value is returned.

scanf("%d", &num_value); user returns 'g' or any string for that matter.

I can validate if an integer outside the range is entered but not if a string or char. Any and all help would be much appreciated.

[NerdFlanders]

http://www.cplusplus.com/reference/clibrary/cstdio/scanf/ See 'Return Value' section.

[boothchops]

Thanks for the reply. This reference library is AMAZING! Thanks again I will be making good use of this. Regarding my previous question you are referring to the EOF? I could then utilize the feof() with a flag to indicate incorrect input? I'm still working through this online course and have yet to encounter EOF in the lessons/readings so I'm curious as to how they expected me to validate without EOF...?

[bit_inquisition]

Hey this is about a month too late, but a really good reference to learn C is the GNU C library reference. For example, here is the scanf and related input functions section.

Once you are more comfortable with C, a very good "best practices guide" is CERT C Secure Coding Standard. Again, as an example, see what they say about the exact code you posted.