#C 语言标准库头文件 stdint.h

这个头文件提供 固定长度的整数类型。

#示例

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

int main(void) {
    // 8位有符号和无符号整数
    int8_t small_int = -128;
    uint8_t small_uint = 255;
    
    // 16位有符号和无符号整数
    int16_t medium_int = -32768;
    uint16_t medium_uint = 65535;
    
    // 32位有符号和无符号整数
    int32_t large_int = -2147483648;
    uint32_t large_uint = 4294967295;
    
    // 64位有符号和无符号整数
    int64_t huge_int = -9223372036854775807LL;
    uint64_t huge_uint = 18446744073709551615ULL;
    
    // 最快的最小宽度类型
    int_fast8_t fast_small = 127;
    uint_fast16_t fast_medium = 65535;
    
    // 最小宽度类型
    int_least8_t least_small = -128;
    uint_least16_t least_medium = 65535;
    
    // 最大宽度整数类型
    intmax_t max_int = INTMAX_MAX;
    uintmax_t max_uint = UINTMAX_MAX;
    
    // 打印各种类型的值
    printf("8-bit signed: %" PRIi8 ", unsigned: %" PRIu8 "\n", small_int, small_uint);
    printf("16-bit signed: %" PRIi16 ", unsigned: %" PRIu16 "\n", medium_int, medium_uint);
    printf("32-bit signed: %" PRIi32 ", unsigned: %" PRIu32 "\n", large_int, large_uint);
    printf("64-bit signed: %" PRIi64 ", unsigned: %" PRIu64 "\n", huge_int, huge_uint);
    printf("Fast types signed: %" PRIiFAST8 ", unsigned: %" PRIuFAST16 "\n", fast_small, fast_medium);
    printf("Least types signed: %" PRIiLEAST8 ", unsigned: %" PRIuLEAST16 "\n", least_small, least_medium);
    printf("Max int: %" PRId64 ", max uint: %" PRIu64 "\n", max_int, max_uint);
    
    // 打印一些类型的尺寸
    printf("Size of int8_t: %zu bytes\n", sizeof(int8_t));
    printf("Size of int16_t: %zu bytes\n", sizeof(int16_t));
    printf("Size of int32_t: %zu bytes\n", sizeof(int32_t));
    printf("Size of int64_t: %zu bytes\n", sizeof(int64_t));
    
    return 0;
}

运行结果：

8-bit signed: -128, unsigned: 255
16-bit signed: -32768, unsigned: 65535
32-bit signed: -2147483648, unsigned: 4294967295
64-bit signed: -9223372036854775807, unsigned: 18446744073709551615
Fast types signed: 127, unsigned: 65535
Least types signed: -128, unsigned: 65535
Max int: 9223372036854775807, max uint: 18446744073709551615
Size of int8_t: 1 bytes
Size of int16_t: 2 bytes
Size of int32_t: 4 bytes
Size of int64_t: 8 bytes

#类型

#宏

#常量

#推荐阅读

• Standard library header <stdint.h>
• Fixed width integer types