进制转换c++代码_C代码实现16位和32位数据字节序转换

进制转换C++代码：

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

// 10进制转2进制
string dec2bin(int n) {
    string res = "";
    while (n) {
        res = to_string(n % 2) + res;
        n /= 2;
    }
    return res;
}

// 2进制转10进制
int bin2dec(string s) {
    int res = 0;
    for (int i = 0; i < s.size(); i++) {
        res = res * 2 + (s[i] - '0');
    }
    return res;
}

// 16进制转10进制
int hex2dec(char c) {
    if ('0' <= c && c <= '9') {
        return c - '0';
    } else {
        return c - 'A' + 10;
    }
}

// 16进制转2进制
string hex2bin(char c) {
    int n = hex2dec(c);
    return dec2bin(n);
}

// 10进制转16进制
char dec2hex(int n) {
    if (n < 10) {
        return n + '0';
    } else {
        return n - 10 + 'A';
    }
}

// 2进制转16进制
char bin2hex(string s) {
    int n = bin2dec(s);
    return dec2hex(n);
}

int main() {
    int n = 233;
    cout << dec2bin(n) << endl;
    string s = "11101001";
    cout << bin2dec(s) << endl;
    char c = 'A';
    cout << hex2dec(c) << endl;
    cout << hex2bin(c) << endl;
    cout << dec2hex(n) << endl;
    string s2 = "11101001";
    cout << bin2hex(s2) << endl;
    return 0;
}

16位和32位数据字节序转换C代码实现：

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

uint16_t swap16(uint16_t x) {
    return (x << 8) | (x >> 8);
}

uint32_t swap32(uint32_t x) {
    return (x << 24) |
           ((x << 8) & 0x00ff0000) |
           ((x >> 8) & 0x0000ff00) |
           (x >> 24);
}

int main() {
    uint16_t x16 = 0x1234;
    uint32_t x32 = 0x12345678;

    printf("%04x\n", x16);
    printf("%08x\n", x32);

    x16 = swap16(x16);
    x32 = swap32(x32);

    printf("%04x\n", x16);
    printf("%08x\n", x32);

    return 0;
}