What is the maximum value for an int32?

Answer 1

2GB

(is there a minimum length for answers?)

Answer 2

If you think the value is too hard to remember in base 10, try base 2: 1111111111111111111111111111111

Answer 3

32 bits, one for the sign, 31 bits of information:

2^31 - 1 = 2147483647

Why -1?
Because the first is zero, so the greatest is the count minus one.

EDIT for cantfindaname88

The count is 2^31 but the greatest can't be 2147483648 (2^31) because we count from 0, not 1.

Rank   1 2 3 4 5 6 ... 2147483648
Number 0 1 2 3 4 5 ... 2147483647

Another explanation with only 3 bits : 1 for the sign, 2 for the information

2^2 - 1 = 3

Below all the possible values with 3 bits: (2^3 = 8 values)

1: 100 ==> -4
2: 101 ==> -3
3: 110 ==> -2
4: 111 ==> -1
5: 000 ==>  0
6: 001 ==>  1
7: 010 ==>  2
8: 011 ==>  3

Answer 4

It's about 2.1 * 10^9. No need to know the exact 2^{31} - 1 = 2,147,483,647.

C

You can find it in C like that:

#include <stdio.h>
#include <limits.h>

main() {
    printf("max int:\t\t%i\n", INT_MAX);
    printf("max unsigned int:\t%u\n", UINT_MAX);
}

gives (well, without the ,)

max int:          2,147,483,647
max unsigned int: 4,294,967,295

C++ 11

std::cout << std::numeric_limits<int>::max() << "\n";
std::cout << std::numeric_limits<unsigned int>::max() << "\n";

Java

You can get this with Java, too:

System.out.println(Integer.MAX_VALUE);

But keep in mind that Java integers are always signed.

Python 2

Python has arbitrary precision integers. But in Python 2, they are mapped to C integers. So you can do this:

import sys
sys.maxint
>>> 2147483647
sys.maxint + 1
>>> 2147483648L

So Python switches to long when the integer gets bigger than 2^31 -1

Answer 5

It's 10 digits, so pretend it's a phone number (assuming you're in the US). 214-748-3647. I don't recommend calling it.

Answer 6

Interestingly, Int32.MaxValue has more characters than 2,147,486,647.

But then again, we do have code completion,

So I guess all we really have to memorize is Int3<period>M<enter>, which is only 6 characters to type in visual studio.

UPDATE For some reason I was downvoted. The only reason I can think of is that they didn't understand my first statement.

"Int32.MaxValue" takes at most 14 characters to type. 2,147,486,647 takes either 10 or 13 characters to type depending on if you put the commas in or not.