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C: How to check if the float is not a char?

Hello again,

I would like to ask how could I check if the input is right:
the program asks user to input a float from a keybord, but what if user inputs a char. Is there any funcion which can check that?

Thanks in advance.
Apr 6 '08 #1
3 7978
553 512MB
Hello again,

I would like to ask how could I check if the input is right:
the program asks user to input a float from a keybord, but what if user inputs a char. Is there any funcion which can check that?

Thanks in advance.

You can use library function ischar() if you are using C to check if the input is a character or a quoted string. ischar returns TRUE if input was char , FALSE otherwise.

Manual method of doing it is this:
Expand|Select|Wrap|Line Numbers
  1.   while(scanf("%f", &myFloatVal) == 0) 
  2.    printf("Invalid input, enter again");
On success, the scanf() function returns the number of items succesfully read.
0 means no successful input (float in this example) is read.

Apr 6 '08 #2
<code snipped>
Nov 7 '08 #3
9,065 Expert Mod 8TB
dewi44: I have removed you coded not only do we not allow posting of full code solutions and it didn't compile as either C or C++ and it was logically incorrect (after you fix the compilation errors try entering the strings "3.5,5" "3.55").

Please read the posting guidelines, paying particular attention to Help on posting coursework questions and answers.. Please do not post full code solutions.

Nov 7 '08 #4

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