What are the largest signed and unsigned ints in c++?
What are the largest signed and unsigned ints in c++?
The "sizes" of the integral types is implementation defined. To find the limits any of the integral types can hold for a given implementation you can use some of the members of the numeric_limits class.
Jim
The specific sizes are implementation defined, but the standard does clearly state the minimum range for all of them. For int/unsigned int, the ranges are -32767 to 32767, and 0 to 65535, respectively. Int and unsigned int may have wider ranges than this, but this is the minimum that the standard requires. it's actually very common for the ranges to be -2,147,483,647 to 2,147,483,647 and 0 to 4,294,967,295 respectively.
Source: Fundamental types - cppreference.com
What can this strange device be?
When I touch it, it gives forth a sound
It's got wires that vibrate and give music
What can this thing be that I found?
Hello,
Found this a long time ago, a quick runtime check.
This works with gcc, don't know about the MS compiler.
Code:unsigned int max = -1; printf("max = %u\n", max);//max = 4294967295
Regards
I would never rely on code like that lol.
If you want to set all the bits of a region of memory, use memset.
Actually, that snippet contains guaranteed behavior, according to the standard. As for "setting all bits," the standard doesn't specify that, but unsigned int underflow is well-defined behavior.Originally Posted by MutantJohn
What can this strange device be?
When I touch it, it gives forth a sound
It's got wires that vibrate and give music
What can this thing be that I found?
Ah, it is indeed well-defined behavior. It's just not very self-documenting or clear code.
It looks like they were using that behavior to set all the bits of an unsigned int to see its largest value which is why I suggested using memset instead. These kinds of things may work but they seem hackish to me in the sense that they don't convey intent and require a tab with the C++ standard open.
You're supposed to just know it. :P
What can this strange device be?
When I touch it, it gives forth a sound
It's got wires that vibrate and give music
What can this thing be that I found?
