C++常用的数学函数总结

#include <iostream>

#include <cmath>

using namespace std;

//一些常用的数学函数总结

int main()

{
//绝对值int abs(int n), long labs(long n), float fabs(float n)
int a = -5;
long b = -41567;
float c = -3.02156;
cout << abs(a) << " " << abs(b) << " " << abs(c) << endl;

//计算e的x次幂 double exp(double x)
cout << exp(20.0) << endl;

//计算lnx double log(double x), log10 x double log10(double x)
cout << log(100.0) << endl;
cout << log10(10.0) << endl;

//计算x的y次幂 double pow(double x, double y)
cout << pow(5.0, 5) << endl;

//计算根号x double sqrt(double x)
cout << sqrt(25.30) << endl;

//计算不超过x的最大整数
cout << floor(2.5) << " " << floor(-2.5) << endl;

system("pause");
return 0;

}