精确计算100的阶乘（C++）

#include <iostream>#include <vector>using namespace std;void calc(vector<int>& v);void print_result(const vector<int>& v);int main() {vector<int> v;calc(v);print_result(v);return 0;}void calc(vector<int>& v) {v.push_back(1);for(int i = 1; i <= 100; ++i) {const int len = static_cast<int>(v.size());for(int j = 0; j < len; ++j) {v[j] *= i;}for(int j = 0; j < len - 1; ++j) {if(v[j] >= 10) {v[j + 1] += v[j] / 10;v[j] %= 10;}}if(v[len - 1] >= 10) {int carry = v[len - 1] / 10;v[len - 1] %= 10;do {v.push_back(carry % 10);carry /= 10;} while (carry > 0);}}}void print_result(const vector<int>& v) {const int len = static_cast<int>(v.size());for(int i = len - 1; i >= 0; --i) {cout << v[i];}cout << endl;}