【C/C++】uin8_t uint16_t uint32_t uint64_t数据类型解析

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1.基本数据类型

C语言中常用的基本数据类型有：char、short、int、long、float、double：

2.无符号数据类型

在上述整型数据类型前加上unsigned，则为无符号类型：

3.整型数据别名

为了代码编写和阅读方便，我们通常会将数据类型名称声明为简写方式，即uin8_t/uint16_t/uint32_t/uint64_t，或者UINT8/UINT16/UINT32/UINT64。因此uin*_t并不是新的数据类型，而是通过关键字typedef声明后的数据形式。

typedef char        INT8;
typedef short       INT16;
typedef int         INT32;
typedef long long   INT64;

typedef unsigned char        UINT8;
typedef unsigned short       UINT16;
typedef unsigned int         UINT32;
typedef unsigned long long   UINT64;

typedef unsigned char        uint8_t;
typedef unsigned short       uint16_t;
typedef unsigned int         uint32_t;
typedef unsigned long long   uint64_t;
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4.代码验证

#include <stdio.h>
#include <stdlib.h>

typedef unsigned char        uint8_t;
typedef unsigned short       uint16_t;
typedef unsigned int        uint32_t;
typedef unsigned long long   uint64_t;

int main(void)
{
    char cData = 'a';
    short sData = 1;
    int iData = 2;
    long lData = 3;
    long long llData = 4;
    uint8_t ucData = 5;
    uint16_t usData = 6;
    uint32_t uiData = 7;
    uint64_t ullData = 8;

    printf(" cData = %c, sizeof(char) = %lu\n", cData, sizeof(cData));
    printf(" sData = %d, sizeof(short) = %lu\n", sData, sizeof(sData));
    printf(" iData = %d, sizeof(int) = %lu\n", iData, sizeof(iData));
    printf(" lData = %ld, sizeof(long) = %lu\n", lData, sizeof(lData));
    printf(" llData = %lld, sizeof(long long) = %lu\n", llData, sizeof(llData));
    printf(" ucData = %u, sizeof(uint8_t) = %lu\n", ucData, sizeof(ucData));
    printf(" usData = %u, sizeof(uint16_t) = %lu\n", usData, sizeof(usData));
    printf(" uiData = %u, sizeof(uint32_t) = %lu\n", uiData, sizeof(uiData));
    printf(" ulData = %llu, sizeof(uint64_t) = %lu\n", ullData, sizeof(ullData));

    return 0;
}

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运行结果：