/******************************************************************************
system function
author: Thin Rabbit
date: 2021-5-22
*******************************************************************************/
#include <iostream>
#include <cmath>
using namespace std;
int main() {
int a=-5;
float b=3.14;
cout<<abs(a)<<endl; //Returns the absolute value of x: |x|
cout<<ceil(b)<<endl; //returning the smallest integral value that is not less than x
cout<<floor(b)<<endl; //Rounds x downward, returning the largest integral value that is not greater than x
cout<<pow(a,2)<<endl; //Returns base raised to the power exponent
cout<<sqrt(9)<<endl; //Returns the square root of x
return 0;
}
