系统函数

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/******************************************************************************
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;
}