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How to detect overflow in C?

How to detect overflow in C?# Programming - 葵花宝典

a*g2005-06-08 07:06

1 楼

Overflow like: Try to use an int32 type to represent a 64-bit integer. Is
there any command or easy way to judge this in C?
Thanks a lot!
Xuan

z*e2005-06-08 07:06

2 楼

http://lists.linux.org.au/archives/linuxcprogramming/2002-June/msg00028.html

【在 a******g 的大作中提到】

: Overflow like: Try to use an int32 type to represent a 64-bit integer. Is
: there any command or easy way to judge this in C?
: Thanks a lot!
: Xuan

t*l2005-06-08 07:06

3 楼

if your platform supports 64-bit integer,
and you only use int32 to store some final results, maybe
you can use your 64-bit int to do the calculation, and
then right-shifted 32 bit and check if it is zero before
assigning the value to your int32.

【在 a******g 的大作中提到】

: Overflow like: Try to use an int32 type to represent a 64-bit integer. Is
: there any command or easy way to judge this in C?
: Thanks a lot!
: Xuan

g*p2005-06-08 07:06

4 楼

google PCL(performance counter library) it will count how many overflows in
your subroutine?

【在 a******g 的大作中提到】

: Overflow like: Try to use an int32 type to represent a 64-bit integer. Is
: there any command or easy way to judge this in C?
: Thanks a lot!
: Xuan