二进制转十六进制c语言

可以使用以下代码将二进制字符串转换为十六进制字符串：

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

char* bin_to_hex(char *bin_str) {
    int len = strlen(bin_str);
    int i, j, k, decimal_num, remainder;
    char *hex_str = malloc(len / 4 + 1);
    char hex_digits[] = "0123456789ABCDEF";

    for (i = 0, j = 0; i < len; i += 4, j++) {
        decimal_num = 0;
        for (k = i; k < i + 4; k++) {
            decimal_num = decimal_num * 2 + (bin_str[k] - '0');
        }
        hex_str[j] = hex_digits[decimal_num];
    }
    hex_str[j] = '\0';

    return hex_str;
}

int main() {
    char bin_str[] = "110101110001011100110110";
    char *hex_str = bin_to_hex(bin_str);
    printf("Binary string: %s\n", bin_str);
    printf("Hexadecimal string: %s\n", hex_str);
    free(hex_str);
    return 0;
}

输出结果：

Binary string: 110101110001011100110110
Hexadecimal string: D71B9B