CODEWITHSUNDEEP
c#phpmath
Marcelo Rodovalho
Marcelo Rodovalho

Reputation: 923

Why different result in same operation? PHP e C#

I have the following operation in PHP:

24733 * 0x41c64e6d + 0x6073;

...and the result is: 27293242579276

With the same logic, I do the same operation in C#:

24733 * 0x41c64e6d + 0x6073;

But the result is: -1274586804

OMG, why?

Upvotes: 0

Views: 99

Answers (2)

Machavity
Machavity

Reputation: 31644

In PHP here's what's happening

int(24733) *
int(1103515245) +
int(24691)

You can see this by doing a var_dump of the values

In 64-bit builds, the maximum integer is 9223372036854775807. So PHP can support the provided answer of 27293242579276. Based on the other answer, it looks like C# just converts the numbers differently, and possibly with a lower maximum integer.

Upvotes: 0

Steve
Steve

Reputation: 11963

by default c# treats number as int when no explicit cast is specified.

so 24733 is treated as int. 

int x int + int = int

and Max int is 2147483647 which is way smaller than 27293242579276. This resulted in integer overflow.

To solve the problem, use a type with higher number of bits such as decimal

you can append a letter "m" at the end of the number to tell c# you want it to be a decimal like 24733m * 0x41c64e6d + 0x6073

Upvotes: 2

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