2进制转16进制代码C语言

在C语言中，将二进制数转换成十六进制数通常需要两个步骤：首先将二进制数分割成每四位一组，然后将每组转换为对应的十六进制字符。下面是一个简单的函数示例，它接受一个字符串形式的二进制数字并返回其十六进制表示：

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

// Function to convert binary to hexadecimal
char* binary_to_hex(char* binary) {
    int len = strlen(binary);
    char hex[8]; // Assuming at most 32 bits (8 bytes), which can be represented by 2 chars for each nibble
    int i = 0;

    // Convert binary to hexadecimal
    while (len >= 4) {
        hex[i++] = '0';
        hex[i++] = 'x'; // Adding '0x' prefix
        int digit = 0;
        for (int j = len - 4; j >= len - 8; j--) {
            digit <<= 1;
            if (binary[j] == '1') {
                digit |= 1;
            }
        }
        hex[i++] = digit + '0';
        hex[i++] = digit > 9 ? digit - 10 + 'A' : digit + '0';
        len -= 4;
    }

    // Handle remaining bits (if any)
    if (len != 0) {
        hex[i] = '0';
        hex[i+1] = 'x'; // Add '0x'
        int remainder = 0;
        for (int j = len - 1; j >= 0; j--) {
            remainder <<= 1;
            if (binary[j] == '1') {
                remainder |= 1;
            }
        }
        hex[i+2] = remainder + '0';
        hex[i+3] = remainder > 9 ? remainder - 10 + 'A' : remainder + '0';
    }

    hex[i] = '\0'; // Append null terminator
    return hex;
}

int main() {
    char binary[] = "1010101010101010"; // Example binary number
    char* hex_result = binary_to_hex(binary);
    printf("Binary %s in hexadecimal is %s\n", binary, hex_result);
    free(hex_result); // Don't forget to free the dynamically allocated memory
    return 0;
}