You can determine the native data model for your system using isainfo -b. The names of the integer types and their sizes in each of the two data models are shown in the following table. Integers are always represented in twos-complement form in the native byte-encoding order of your system.
Integer types may be prefixed with the signed or unsigned qualifier. Case two can be figured out by defining two functions and miss some performance. Call "function t " measure the length by some copy-work and send the result to function2, where you can do whatever you want on variable array-sizes. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Is the size of C "int" 2 bytes or 4 bytes?
Ask Question. Asked 9 years, 4 months ago. Active 2 years, 8 months ago. Viewed k times. Rajiv Prathap Rajiv Prathap 2, 2 2 gold badges 12 12 silver badges 8 8 bronze badges.
You asked about the size of "integer"; you probably meant to ask about the size of int. And you should find better textbooks. A textbook that says an int is 2 bytes a probably refers to an old system, and b fails to make it clear that the size will vary from one system to another.
See also question Just use sizeof. Add a comment. Active Oldest Votes. RajivPrathap: Well, it's compiler-dependent, but the compiler decides whether or not it's also machine-dependent. Not just machine dependent, it also depends on the operating system running on the machine. For instance long in Win64 is 4 bytes whereas long in Linux64 is 8 bytes. A byte is not required to be 8 bits and some machines don't have a 8 bit addressable unit which basically is the definition of a byte in the standard.
The answer is not correct without further information. Show 4 more comments. FatalError FatalError But, C doesn't guarantee it to be the case. Imagine, I can hold 3 digits 0 or 1 , so I can go from to which is decimal 7. If I could go until 8 then I could use those 4 digits all the way up to 15! Such as is right before an exponent of 2, exhausting all the bits bytes it has available. So -8 to 7, to and so on. Negative numbers don't have to count the zero. C doesn't make that assumption.
That's why the minimum range for an int is [ Show 2 more comments. AnT AnT k 39 39 gold badges silver badges bronze badges. The idea behind int was that it was supposed to match the natural "word" size on the given platform - This is what I was looking for. Any idea what the reason may be? In a free world, int could occupy any number of consecutive bytes in the memory right?
But irrespective of platform, you can reliably assume the following types: [8-bit] signed char: to [8-bit] unsigned char: 0 to [bit]signed short: to [bit]unsigned short: 0 to [bit]signed long: to [bit]unsigned long: 0 to [bit]signed long long: to [bit]unsigned long long: 0 to Given below is an example to get the size of various type on a machine using different constant defined in limits. The header file float.
The void type specifies that no value is available. There are various functions in C which do not return any value or you can say they return void. A function with no return value has the return type as void. For example, void exit int status ;. There are various functions in C which do not accept any parameter. The size of an int is really compiler dependent. Back in the day, when processors were 16 bit, an int was 2 bytes. Still, using sizeof int is the best way to get the size of an integer for the specific system the program is executed on.
Ex: Here in this program the number is a variable declared with int data type so this variable will allocate 4byte of memory.
Integer variables need not necessarily occupy 4 bytes. In an 8 bit machine, the integer var occupies 2 bytes. In 32 and 64 bit machines, integer var occupies 4 bytes. The 8-byte count taken up by pointers is crucially exclusive to bit machines, and for a reason — 8 bytes is the largest possible address size available on that architecture.
What is an Array? An array is a collection of same type of elements which are sheltered under a common name. The number of 8 bit bytes that each element occupies depends on the type of array.
Character Arrays Character Array is a sequential collection of data type char. Strings are immutable. Character Arrays are mutable. Built in functions like substring , charAt etc can be used on Strings.
String and Character Array.
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