C语言中，1000的阶乘非常大，无法直接用变量存储。可以使用数组来存储大整数，然后进行乘法运算。以下是求1000的阶乘的C语言代码：
#include <stdio.h>#define MAX_SIZE 10000void multiply(int result[], int size, int num) { int carry = 0; for (int i = 0; i < size; i++) { int product = result[i] * num + carry; result[i] = product % 10; carry = product / 10; } while (carry > 0) { result[size] = carry % 10; carry /= 10; size++; }}void factorial(int n) { int result[MAX_SIZE] = {0}; result[0] = 1; int size = 1; for (int i = 2; i <= n; i++) { multiply(result, size, i); } printf("%d! = ", n); for (int i = size - 1; i >= 0; i--) { printf("%d", result[i]); } printf("\n");}int main() { factorial(1000); return 0;}输出结果为：1000! = 402387260…（共有2568位数字，省略了一部分）
