W3School TIY Editor

#include <iostream> #include <cmath> using namespace std; int main() { cout << "64 的平方根是: " << sqrt(64) << "\n"; cout << "2.6 四舍五入后的整数是: " << round(2.6) << "\n"; cout << "2 的自然对数是: " <<log(2) << "\n"; return 0; }