用C语言写一个进制转换器

以下是将十进制数转换为二进制、八进制、十六进制的示例代码：

#include <stdio.h>

void toBinary(int num) {
    int binary[50], i = 0;
    while (num > 0) {
        binary[i] = num % 2;
        num /= 2;
        i++;
    }
    printf("Binary: ");
    for (int j = i - 1; j >= 0; j--) {
        printf("%d", binary[j]);
    }
    printf("\n");
}

void toOctal(int num) {
    int octal[50], i = 0;
    while (num > 0) {
        octal[i] = num % 8;
        num /= 8;
        i++;
    }
    printf("Octal: ");
    for (int j = i - 1; j >= 0; j--) {
        printf("%d", octal[j]);
    }
    printf("\n");
}

void toHexadecimal(int num) {
    char hex[50];
    int i = 0, rem;
    while (num > 0) {
        rem = num % 16;
        if (rem < 10) {
            hex[i] = rem + 48;
        } else {
            hex[i] = rem + 55;
        }
        num /= 16;
        i++;
    }
    printf("Hexadecimal: ");
    for (int j = i - 1; j >= 0; j--) {
        printf("%c", hex[j]);
    }
    printf("\n");
}

int main() {
    int num;
    printf("Enter a decimal number: ");
    scanf("%d", &num);
    toBinary(num);
    toOctal(num);
    toHexadecimal(num);
    return 0;
}

示例输出：

Enter a decimal number: 123
Binary: 1111011
Octal: 173
Hexadecimal: 7B