常用函数和STL

#include <bits/stdc++.h>

using namespace std;
#define PI acos(-1.0)
int main()
{
    printf("%f
",asin(0.5));//求反正弦
    printf("%f
",sin(30*PI/180.0));//求正弦
    printf("%f
",exp(1));//求e^x
    printf("%f
",log(exp(1)));//求以e为底的自然对数
    printf("%f
",sqrt(4));//求根
    printf("%f
",pow(2,exp(1)));//求幂
}