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Questions tagged [integer]

Common datatype in many programming languages for representing a whole number. Use this tag for questions about using, storing, or manipulating integers.

An integer is a whole number that can be negative, positive, or zero. (e.g. ... -2, -1, 0, 1, 2 ...) Use this tag for questions about using, storing, or manipulating integers.

For further reading, here is a Wikipedia article on integers.

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What's the most efficient way to test two integer ranges for overlap?

Given two inclusive integer ranges [x1:x2] and [y1:y2], where x1 ≤ x2 and y1 ≤ y2, what is the most efficient way to test whether there is any overlap of the two ranges? A simple implementation is as follows: bool testOverlap(int x1, int x2, int y1,…
WilliamKF
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How do I work around JavaScript's parseInt octal behavior?

Try executing the following in JavaScript: parseInt('01'); //equals 1 parseInt('02'); //equals 2 parseInt('03'); //equals 3 parseInt('04'); //equals 4 parseInt('05'); //equals 5 parseInt('06'); //equals 6 parseInt('07'); //equals 7 parseInt('08');…
Portman
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How to find length of digits in an integer?

In Python, how do you find the number of digits in an integer?
Strigoides
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How to convert an int to string in C?

How do you convert an int (integer) to a string? I'm trying to make a function that converts the data of a struct into a string to save it in a file.
user1063999
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8 answers

Convert floats to ints in Pandas?

I've been working with data imported from a CSV. Pandas changed some columns to float, so now the numbers in these columns get displayed as floating points! However, I need them to be displayed as integers, or, without comma. Is there a way to…
MJP
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Convert array values from string to int?

The following code: $string = "1,2,3" $ids = explode(',', $string); var_dump($ids); Returns the array: array(3) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" } I need for the values to be of type int instead of type…
cwal
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What is the difference between an int and an Integer in Java and C#?

I was reading More Joel on Software when I came across Joel Spolsky saying something about a particular type of programmer knowing the difference between an int and an Integer in Java/C# (Object-Oriented Programming Languages). So, what is the…
CodingWithoutComments
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Mapping two integers to one, in a unique and deterministic way

Imagine two positive integers A and B. I want to combine these two into a single integer C. There can be no other integers D and E which combine to C. So combining them with the addition operator doesn't work. Eg 30 + 10 = 40 = 40 + 0 = 39 +…
harm
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How to properly compare two Integers in Java?

I know that if you compare a boxed primitive Integer with a constant such as: Integer a = 4; if (a < 5) a will automatically be unboxed and the comparison will work. However, what happens when you are comparing two boxed Integers and want to…
Samatha84
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10 answers

Safest way to convert float to integer in python?

Python's math module contain handy functions like floor & ceil. These functions take a floating point number and return the nearest integer below or above it. However these functions return the answer as a floating point number. For example: import…
Boaz
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Python integer division yields float

Python 3.1 (r31:73574, Jun 26 2009, 20:21:35) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> 2/2 1.0 Is this intended? I strongly remember earlier versions returning int/int=int? What…
Jonas Byström
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How to cast an Object to an int

How can I cast an Object to an int in java?
Sheehan Alam
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How does Java handle integer underflows and overflows and how would you check for it?

How does Java handle integer underflows and overflows? Leading on from that, how would you check/test that this is occurring?
KushalP
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Converting integer to binary in python

In order to convert an integer to a binary, I have used this code : >>> bin(6) '0b110' and when to erase the '0b', I use this : >>> bin(6)[2:] '110' What can I do if I want to show 6 as 00000110 instead of 110?
Smith
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Java integer to byte array

I got an integer: 1695609641 when I use method: String hex = Integer.toHexString(1695609641); system.out.println(hex); gives: 6510f329 but I want a byte array: byte[] bytearray = new byte[] { (byte) 0x65, (byte)0x10, (byte)0xf3,…
stefan
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