How are narcissistic numbers represented in the C language?

In the C programming language, you can use the following code to represent narcissistic numbers:

#include <stdio.h>
#include <math.h>

int main() {
    int num, originalNum, remainder, result = 0, n = 0;
    
    printf("请输入一个三位数：");
    scanf("%d", &num);

    originalNum = num;

    // 计算位数
    while (originalNum != 0) {
        originalNum /= 10;
        ++n;
    }

    originalNum = num;

    // 计算水仙花数
    while (originalNum != 0) {
        remainder = originalNum % 10;
        result += pow(remainder, n);
        originalNum /= 10;
    }

    if (result == num)
        printf("%d 是一个水仙花数", num);
    else
        printf("%d 不是一个水仙花数", num);

    return 0;
}

In the above code, by entering a three-digit number, first calculate the number of digits n in that number, then raise each digit on that number to the power of n, and finally add all these results to get a result. If the result is equal to the original three-digit number num, then the number is an Armstrong number; otherwise, it is not an Armstrong number.