# <stdint.h>

**[<stdint.h>](https://en.cppreference.com/w/c/header/stdint)** provides fixed-width integer types (C99): `int8_t`, `uint32_t`, `int64_t`, etc., guaranteeing exact widths across platforms. Also includes `intmax_t`, `intptr_t`, and limit macros like `INT32_MAX`.

Use fixed-width types for binary I/O, hardware registers, and portable low-level code.

## Example

This example queries the sizes of fixed-width integer types on the platform.

```c
// compile: gcc -o stdintexample stdintexample.c
// run: ./stdintexample
// description: show fixed-width integer type sizes

#include <stdint.h>
#include <stdio.h>

int main() {
    printf("int8_t = %zu bytes\n", sizeof(int8_t));
    printf("int16_t = %zu bytes\n", sizeof(int16_t));
    printf("int32_t = %zu bytes\n", sizeof(int32_t));
    printf("int64_t = %zu bytes\n", sizeof(int64_t));
    printf("intptr_t = %zu bytes\n", sizeof(intptr_t));
    printf("INT32_MAX = %d\n", INT32_MAX);
    printf("UINT64_MAX = %llu\n", (unsigned long long)UINT64_MAX);
    
    return 0;
}
```