dev-cpp-users

[Dev-C++] Warning when compiling constant expression

[David M. <ci...@ya...>]

A line in my program reads

const unsigned long prime_product = 3 * 5 * 7 * 11 * 13 * 17 * 19 *
23 * 29;

When compiling in Linux (g++ 3.3.1) I get the warning 
factor.cpp:12: warning: integer overflow in expression

I figure it is using signed integers as temporary variables so I try.

const unsigned long prime_product = 3234846615; 
//3234846615 is the result of the above calculation.

Now I get this warning.
factor.cpp:12: warning: this decimal constant is unsigned only in ISO
C90

My code assumes a 32-bit system, which means an unsigned int is
capable of storing 2^32 (4,294,967,296) which is greater then the
number I am attempting to store in it? These are just warnings but I
still want to figure out why I am getting them.

Thanks in Advance
David McKen

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Re: [Dev-C++] Warning when compiling constant expression

[Michal M. <mol...@se...>]

David McKen wrote:
> const unsigned long prime_product = 3234846615; 
> //3234846615 is the result of the above calculation.
> 
> Now I get this warning.
> factor.cpp:12: warning: this decimal constant is unsigned only in ISO
> C90
> 
> My code assumes a 32-bit system, which means an unsigned int is
> capable of storing 2^32 (4,294,967,296) which is greater then the
> number I am attempting to store in it? These are just warnings but I
> still want to figure out why I am getting them.

you could try:
const unsigned long prime_product = 3234846615U;

Re: [Dev-C++] Warning when compiling constant expression

[David M. <ci...@ya...>]

That Works :)

--- Michal Molhanec <mol...@se...> wrote:
> David McKen wrote:
> > const unsigned long prime_product = 3234846615; 
> > //3234846615 is the result of the above calculation.
> > 
> > Now I get this warning.
> > factor.cpp:12: warning: this decimal constant is unsigned only in
> ISO
> > C90
> > 
> > My code assumes a 32-bit system, which means an unsigned int is
> > capable of storing 2^32 (4,294,967,296) which is greater then the
> > number I am attempting to store in it? These are just warnings
> but I
> > still want to figure out why I am getting them.
> 
> you could try:
> const unsigned long prime_product = 3234846615U;

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