size_t
From cppreference.com
Defined in header <stddef.h>
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Defined in header <stdio.h>
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Defined in header <stdlib.h>
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Defined in header <string.h>
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Defined in header <time.h>
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Defined in header <uchar.h>
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(since C11) |
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Defined in header <wchar.h>
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(since C95) |
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typedef /*implementation-defined*/ size_t; |
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size_t is the unsigned integer type of the result of sizeof , alignof (since C11) and offsetof.
Notes
size_t can store the maximum size of a theoretically possible object of any type (including array).
size_t is commonly used for array indexing and loop counting. Programs that use other types, such as unsigned int, for array indexing may fail on, e.g. 64-bit systems when the index exceeds UINT_MAX or if it relies on 32-bit modular arithmetic.
Example
Run this code
Possible output:
SIZE_MAX = 18446744073709551615 size = 400
See also
signed integer type returned when subtracting two pointers (typedef) | |
byte offset from the beginning of a struct type to specified member (function macro) | |
C++ documentation for size_t
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