Why? The truth is I entered 12ab, not 12. I want it to display error message when it cannot convert the whole array into integer. Any suggestion?
Tks.
Thu, 01 Apr 2004 21:49:05 GMT
Joona I Palast #2 / 4
atoi ( ) to return error if fail......
Quote:
> Dear All, > My code :- > ************ > fgets ( a, 50, stdin); > b=atoi (a); > printf("%d", b); > ************* > 1st run:- > 12 (enter) > 12 (displayed) > 2nd run:- > 12abc (enter) > 12 (displayed) > Why? The truth is I entered 12ab, not 12. I want it to display error > message when it cannot convert the whole array into integer. Any > suggestion?
What you ask for can't be done with the atoi() function. The atoi() function has no error conditions, it just chops off the erroneous portion of the string. Look up strtol() instead.
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> Why? The truth is I entered 12ab, not 12. I want it to display error > message when it cannot convert the whole array into integer. Any > suggestion?
No error has occured. The purpose of atoi() is to convert the initial portion of the string which has been done.
If you want to know about characters left over (unused) in the string have a look at the function strtol(). (I always use this in preference to atoi()).
> Why? The truth is I entered 12ab, not 12. I want it to display error > message when it cannot convert the whole array into integer. Any > suggestion?
atoi ( ) to return error if fail......