c语言输入一个二进制数，将其转化为十进制数和十六进制数再输出

在C语言中，将二进制数转换为十进制和十六进制通常需要用户手动输入，然后通过循环和位操作来进行计算。下面是一个简单的示例程序，演示了如何实现这个功能：

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

// Function to convert binary to decimal
int binaryToDecimal(char *binary) {
    int decimal = 0;
    int base = 1;
    int len = strlen(binary);

    for (int i = len - 1; i >= 0; i--) {
        if (binary[i] == '1') {
            decimal += base;
        }
        base *= 2;
    }

    return decimal;
}

// Function to convert decimal to hexadecimal
char* decimalToHexadecimal(int decimal) {
    char hex[17]; // Assuming a maximum of 16 digits in hexadecimal
    memset(hex, '0', sizeof(hex));
    int index = 0;

    while (decimal != 0) {
        hex[index++] = (decimal % 16) + '0';
        if (hex[index - 1] > '9') {
            hex[index++] = 'A' - ('0' - (hex[index - 1] - '0'));
        }
        decimal /= 16;
    }

    hex[--index] = '\0'; // NULL terminate the string
    reverse(hex); // Reversing the string since we start from right

    return hex;
}

void reverse(char str[]) {
    int left = 0, right = strlen(str) - 1;
    while (left < right) {
        std::swap(str[left], str[right]);
        left++;
        right--;
    }
}

int main() {
    char binary[32];
    printf("Enter a binary number: ");
    scanf("%s", binary);
    
    int decimal_num = binaryToDecimal(binary);
    printf("Decimal representation: %d\n", decimal_num);

    char hex_num[17];
    strcpy(hex_num, decimalToHexadecimal(decimal_num));
    printf("Hexadecimal representation: %s\n", hex_num);

    return 0;
}