C programming validating user input dating motorcycle

Posted by / 11-Jan-2020 06:48

I have been unsuccessful in doing this so I decided to start over. If any further information is needed please let me know. 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. The user will be presented with a list of 5 selections they can make.

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). 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? They will then be prompted for which selection they want to enter (which can only be 1-5, no characters or anything like it).

My problem has been is validating user input and how to go about it.

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). I am writing a C computer program for an intro to C course. I am creating an application that will do currency conversions.

I have been unsuccessful in doing this so I decided to start over. If any further information is needed please let me know. Look up the isdigit() function, which will tell you if the character you saw was a digit from 0 to 9.

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). Look up the ispunct() function, which will tell you if the character you saw was punctuation.

The only thing is though that when I enter a 1 to select Euro the app does absolutely nothing. The user will be presented with a list of 5 selections they can make.

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. 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. the trick is to initialize the flag to force the loop to be entered the first time...Also, float is a very poor choice for storing currency values. 1.29 will be converted into 1 (or perhaps an error will be raised).I guess that only allowing integral values would be bad for the purpose of the assignment, but I do not know for sure.The only thing is though that when I enter a 1 to select Euro the app does absolutely nothing. My problem has been is validating user input and how to go about it. Stepping through a program can be a very educational way of learning how to create good logic. In reality this could be written with only one printf and one scanf (and no getchar()) - place the prompting string and the input function inside a while loop that will iterate the loop when a flag variable is true (or false) depending upon whether you prefer testing positive or negative conditions...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). the trick is to initialize the flag to force the loop to be entered the first time...

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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.

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