What Does Int Mean in C, C and C#

Int, short for integer, is a fundamental variable type  built into the compiler and used to define numeric variables holding whole numbers. Other data types include  float  and  double. C, C,  C# and many other programming languages recognize int as a data type.   In C, the following is how you declare an integer variable: int a 7; Int Limitations Only whole numbers can be stored in  int variables, but because they can store both positive and negative numbers, theyre also considered signed. For example, 27, 4908 and -6575 are valid int entries, but 5.6 and b are not.  Numbers with fractional parts require a float or double type variable, both of which can contain decimal points. The size of number that can be stored in int usually is not defined in the language, but instead depends on the computer running the program. In C#, int is 32 bits, so the range of values is from -2,147,483,648 to 2,147,483,647. If larger values are required, the double type can be used. What Is  Nullable Int? Nullable int has the same range of values as int, but it can store null in addition to whole numbers. You can assign a value to nullable int just as you would for int, and you can also assign a null value.   Nullable int  can be useful when you want to add another state (invalid or uninitialized) to a value type. Nullable int cannot be used in loops since loop variables must always be declared as int. Int vs. Float and Double Int is similar to the float and double types, but they serve different purposes. Int: Takes up less space than other types  Has faster arithmeticUses only whole numbersUses caches and data transfer bandwidth more efficiently Float and double types: Uses twice as much memoryCan contain a decimal pointCan contain more characters The difference between float and double types lies in the range of values. The range of double is twice that of float, and it accommodates more digits. Note:  INT is also used as a formula in  Microsoft  Excel to  round numbers down, but it has nothing to do with int as described on this page.