• Kagan Kayal (13/13) Mar 02 2007 Dear community,
• torhu (3/9) Mar 02 2007 atof and atoi are from the C library, and behave according to the C

Kagan Kayal <agapasa yahoo.de> writes:

Dear community,

I am a rather new user of the D Language. Forgive me if I repeat something that
is already known. Being an engineer, I am more interested in mathematical
stuff. I discovered the following problems with the standard conversion
functions atof and atoi:

1. The standard atof or atoi functions convert any garbage like "abc" to zero.
2. If the input string represents a valid number, but too big;
- atof returns inf. This is not too bad but you find out this either when you
convert it back to a string, which returns "inf" or when you explicitly test
with the isinf function. That may be too late...
- atoi returns an integer value, which is something wrong.

I believe in both cases they should throw an exception.

My Environment in short:
DMD Compiler version 1.007
MS Vista 32 Bit
AMD Athlon 64 X2 4200

Best regards,

Kagan

torhu <fake address.dude> writes:

Kagan Kayal wrote:
 1. The standard atof or atoi functions convert any garbage like "abc" to zero.
 2. If the input string represents a valid number, but too big;
 - atof returns inf. This is not too bad but you find out this either when you
convert it back to a string, which returns "inf" or when you explicitly test
with the isinf function. That may be too late...
 - atoi returns an integer value, which is something wrong.
 
 I believe in both cases they should throw an exception.

atof and atoi are from the C library, and behave according to the C 
standard.  std.conv has functions that throw exceptions on errors.