What is size_t in C?

Question

What is size_t in C?

I'm getting mistaken for size_t in C. I realize that it is returned by the sizeof operator. However, what precisely right? Is it a data type?

Suppose I have a for loop:

for(i = 0; i < some_size; i++)

Should I use int i; or size_t i;?

size-t int

3 years ago by Bharatv4tg1

2 Answers

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**bape** · Answer 1 · 2021-05-07T18:11:15

int* and *size_t* are long unsigned integer datatypes in C language. But the difference is *size_t* takes 8 bytes and *int takes 4 bytes of memory in 32 bit GCC compiler. We see this with an example:



#include <stdio.h>

int main(){

    printf("int size is %ld\n", sizeof(int));

    printf("int size is %ld\n", sizeof(size_t));

    return 0;

}

**RoliMishra** · Answer 2 · 2021-05-10T13:56:34

size_t is a type that can hold any array index.

Depending on the implementation, it can be any of:

unsigned char

unsigned short

unsigned int

unsigned long

unsigned long long

Here's how size_t is defined in stddef.h of my machine:

typedef unsigned long size_t;

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What is size_t in C?

2 Answers

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