超级无敌叼的阶乘计算，使用命令行输入，能算到114514!哦

superFactorial.c

#include <stdio.h>

#define MAX_LENGTH 1048576

int superMultiplication(int a, int *b, int bSize) {
    int carry = 0;
    for (int i = 0; i < bSize; i++) {
        int temp = b[i] * a + carry;
        b[i] = temp % 10;
        carry = temp / 10;
    }
    while (carry) {
        b[bSize] = carry % 10;
        carry /= 10;
        bSize++;
    }
    return bSize;
}

int superFactorial(int n, int *result, int resultSize) {
    if (n == 0) {
        return 1;
    }
    while (n > 0) {
        resultSize = superMultiplication(n, result, resultSize);
        n--;
    }
    return resultSize;
}

void superPrint(int *result, int resultSize) {
    for (int i = resultSize - 1; i >= 0; i--) {
        printf("%d", result[i]);
    }
    printf("\n");
}

int char2int(char *str) {
    int result = 0;
    while (*str) {
        result = result * 10 + *str - '0';
        str++;
    }
    return result;
}

int main(int argc, char *argv[]) {
    if (argc == 0 || argc > 2) {
        printf("Error Arguments!");
    }
    int n = char2int(argv[1]);

    int result[MAX_LENGTH] = {1};

    int r = superFactorial(n, result, 1);
    superPrint(result, r);

    return 0;
}