C programming validating user input Newzealand xxx

The only thing is though that when I enter a 1 to select Euro the app does absolutely nothing. Once they select the number, 1 for Euro, 2 for Deutsche Mark etc, it will prompt you for how many US dollars you want to convert to your selected currency.

The link below has what I have so far and now when I put a character say 'f' when it asks me for a selection number, it asks me again for a selection # (meaning that i inputted a wrong data type). They will then be prompted for which selection they want to enter (which can only be 1-5, no characters or anything like it). 12.26b: If fflush() won't work, what can I use to flush input? If you're trying to get rid of an unread newline or other unexpected input after calling scanf() (see questions 12.18a-12.19), you really need to rewrite or replace the call to scanf() (see question 12.20). ----------------------------------------------------------- I suggest that you investigate the is* family of functions (isdigit(), ispunct(), etc.). A simpler alternative is to simply call sscanf() and check for errors. I am writing a C computer program for an intro to C course. I am creating an application that will do currency conversions.

I'm trying to validate user input that user must enter number and it must be greater than 0, the validation of only numbers I got it working; however, I can't seem to incorporate the validation of greater than 0 I think that should fix it.

I don't know what you had going on in that while condition. Zexanima's version because he's using the assignment operator ('=') instead of the comparator ('==') (or in the case: unequality comparator '!

My problem has been is validating user input and how to go about it. Since its definition of "flush" is to complete the writing of buffered characters (not to discard them), discarding unread input would not be an analogous meaning for fflush on input streams. Once they select the number, 1 for Euro, 2 for Deutsche Mark etc, it will prompt you for how many US dollars you want to convert to your selected currency. Alternatively, you can consume the rest of a partially-read line with a simple code fragment like while((c = getchar()) ! = EOF) /* discard */ ; (You may also be able to use the curses flushinp() function.) There is no standard way to discard unread characters from a stdio input stream, nor would such a way necessarily be sufficient, since unread characters can also accumulate in other, OS-level input buffers. the input value should be tested after the scanf with an if statement this if statement should change the flag to a value that will cause the loop to exit when a valid value is entered or in the else condition print an error message and leave the flag alone (so that the loop will repeat and a new value may be entered). chuck wrote: I need some help with validating user input.

During the step for selecting what currency you want to convert to and when entering the amount of use dollars, they have to be certain data types. If it is anything else they will go thru a loop and be prompted again to give a selection number (1-5). From the C FAQ: 12.26a: How can I flush pending input so that a user's typeahead isn't read at the next prompt? After entering a dollar number 0, it will do the conversion and display it for you. If you're trying to actively discard typed-ahead input (perhaps in anticipation of issuing a critical prompt), you'll have to use a system-specific technique; see questions 19.1 and 19.2. I am writing a C computer program for an intro to C course. I am creating an application that will do currency conversions.

The link below has what I have so far and now when I put a character say 'f' when it asks me for a selection number, it asks me again for a selection # (meaning that i inputted a wrong data type). They will then be prompted for which selection they want to enter (which can only be 1-5, no characters or anything like it).You may also want to check for a currency symbol like the dollar sign or the pound sign or the deutchmark sign or the euro sign, etc.If you want to get fancy-pants, you could check for commas and alternative formats like angle brackets for negative values (sometimes used in banking applications because they are much more striking than a negative sign).Once they select the number, 1 for Euro, 2 for Deutsche Mark etc, it will prompt you for how many US dollars you want to convert to your selected currency.After entering a dollar number 0, it will do the conversion and display it for you.

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