C语言实现混合纠错方式的差错控制代码

这是一个实现混合纠错方式的差错控制代码：

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

#define CODE_SIZE 32
#define ERROR_NUM 3

int hamming_weight(int n) {
    int count = 0;
    while (n) {
        count++;
        n &= n - 1;
    }
    return count;
}

int hamming_distance(int a, int b) {
    return hamming_weight(a ^ b);
}

int parity(int n, int bit) {
    int count = 0;
    for (int i = 0; i < n; i++) {
        if ((i & (1 << bit)) && (n & (1 << i))) {
            count++;
        }
    }
    return count % 2;
}

int hamming_encode(int data) {
    int code = 0;
    for (int i = 0; i < CODE_SIZE; i++) {
        code |= parity(data, i) << i;
    }
    return code;
}

int hamming_decode(int code) {
    int error = 0;
    for (int i = 0; i < CODE_SIZE; i++) {
        if (parity(code, i) != ((code >> i) & 1)) {
            error |= 1 << i;
        }
    }
    if (error) {
        int min_dist = CODE_SIZE + 1;
        int nearest = 0;
        for (int i = 0; i < (1 << CODE_SIZE); i++) {
            int dist = hamming_distance(code, i);
            if (dist < min_dist) {
                min_dist = dist;
                nearest = i;
            }
        }
        code = nearest;
    }
    return code;
}

int mix_encode(int data) {
    int hamming_code = hamming_encode(data);
    int error_code = rand() % (1 << ERROR_NUM);
    int mix_code = hamming_code | (error_code << CODE_SIZE);
    return mix_code;
}

int mix_decode(int mix_code) {
    int hamming_code = mix_code & ((1 << CODE_SIZE) - 1);
    int error_code = mix_code >> CODE_SIZE;
    int decoded_code = hamming_decode(hamming_code);
    if (decoded_code != hamming_code) {
        printf("Detected %d errors.\n", hamming_distance(hamming_code, decoded_code));
    }
    return decoded_code;
}

int main() {
    srand(42);
    int data = 0b01100110;
    printf("Original data: %x\n", data);
    int mix_code = mix_encode(data);
    printf("Mixed code: %x\n", mix_code);
    int decoded_code = mix_decode(mix_code);
    printf("Decoded data: %x\n", decoded_code);
    return 0;
}

代码中使用了 Hamming 编码来实现纠错码，使用了随机的错误码来实现混合纠错方式。在 mix_decode 函数中，先将输入的混合码分离出 Hamming 码和错误码，然后对 Hamming 码进行解码，如果解码后的码与原来的 Hamming 码不同，则表示检测到了错误，输出错误的位数。最后返回解码后的数据。