How much memory is allocated for a int variable?
Table of Contents
How much memory is allocated for a int variable?
Data Types in C
| Data Type | Memory (bytes) | Range |
|---|---|---|
| int | 4 | -2,147,483,648 to 2,147,483,647 |
| long int | 4 | -2,147,483,648 to 2,147,483,647 |
| unsigned long int | 4 | 0 to 4,294,967,295 |
| long long int | 8 | -(2^63) to (2^63)-1 |
How do I know allocated memory size?
No. There is no portable way to get the size of the allocated block of memory in C, if it was allocated using malloc, calloc, or realloc….The most common way to allocate memory is using malloc() :
- #include
- #include
- #include
- struct person {
- long uuid;
- char name[256];
- };
- int main() {
How many bytes of memory are allocated for int?
Data Types and Sizes
| Type Name | 32–bit Size | 64–bit Size |
|---|---|---|
| char | 1 byte | 1 byte |
| short | 2 bytes | 2 bytes |
| int | 4 bytes | 4 bytes |
| long | 4 bytes | 8 bytes |
Can I specify the size of memory to be allocated?
It’s however possible and even common that some of the constructors called allocate more memory. [ Really not recommended for production code, but it can be done – read up very carefully.].
What do you mean by memory allocation?
Memory allocation is the process of setting aside sections of memory in a program to be used to store variables, and instances of structures and classes. When you declare a variable or an instance of a structure or class. The memory for that object is allocated by the operating system.
Can you change the size of memory allocated dynamically using malloc?
If you use malloc then you can not get the size. In the other hand, if you use OS API to dynamically allocate memory, like Windows heap functions, then it’s possible to do that.
Can I use malloc in C++?
malloc(): It is a C library function that can also be used in C++, while the “new” operator is specific for C++ only. Both malloc() and new are used to allocate the memory dynamically in heap.
What is range of int data type?
-2,147,483,648 to 2,147,483,647
In this article
| Type Name | Bytes | Range of Values |
|---|---|---|
| int | 4 | -2,147,483,648 to 2,147,483,647 |
| unsigned int | 4 | 0 to 4,294,967,295 |
| __int8 | 1 | -128 to 127 |
| unsigned __int8 | 1 | 0 to 255 |