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This is what i've done so far: So far it won't take negative numbers, but if i put in a character it loops the for statement (sorry if thats the wrong terminology) How do i get it to request the user to re-enter a positive integer if they had input a character the first time? You two, fight to the death - Stewie Using scanf() will not let you see the error if the user enters a number such as 999hhh, as the 999 will be placed into the int variable, and hhh will be left in the input stream, unseen by the program. Originally posted by Walt P Hammer, every time I use your links to look at a FAQ I get a 'table of contents' for the FAQs -- no matter what link you give. And before it's suggested, no, using IE is not an appropriate option...thanks for any help Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! Only NS and Mozilla has the "open in new window" with one click of the mouse wheel.It is possible to provide the user with immediate feedback on bad input and to prevent them from posting a page until it has been corrected.A major, and growing, source of security vulnerabilities is the failure of programs to validate all input from outside the program—that is, data provided by users, from files, over the network, or by other processes.My question is: What is the best way to validate input so it doesn't crash the program??? For example, if I enter "ffff", it will output: "Enter choice: Enter choice: Enter choice: Enter choice: " If I enter "fff" it will show "Enter choice: " three times. That is because cin is trying to read the f's one character at a time, because only one letter fits into char.I don't know if this is the best solution, but you could make choice a string instead and use getline for input.NET and walks through an example of adding validation to a page.
See If you are taking input from a user or other untrusted source and displaying it, you need to be careful that your display routines do not process format strings received from the untrusted source.This chapter describes some of the ways in which unvalidated input can be exploited, and some coding techniques to practice and to avoid.Any time your program accepts input from an uncontrolled source, there is a potential for a user to pass in data that does not conform to your expectations.Naturally this will not work perfectly for all input.For example, if you wanted to make sure that the 6 character string was indeed 6 characters or that the values were in a specific range, you would have to do this manually: Every one of these techniques can be modified to perform weaker or stronger checking, or specialized validation as required.