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Libreria di funzione <cmath> C++
C ++中的atan()函数以弧度形式返回数字(参数)的反正切值。
此函数在<cmath>头文件中定义。
[数学] tan-1x = atan(x) [C++];
double atan(double x); float atan(float x); long double atan(long double x); double atan(T x); //为整型
atan()函数采用一个强制性参数(可以为正,负或零)
atan()函数返回[-π/ 2,π/ 2]范围内的值。
#include <iostream> #include <cmath> using namespace std; int main() { double x = 57.74, result; result = atan(x); cout << "atan(x) = " << result << " radian" << endl; //Output in gradi cout << "atan(x) = " << result*180/3.1415 << " gradi" << endl; return 0; }
Quando si esegue il programma, l'output è:
atan(x) = 1.55348 radians atan(x) = 89.0104 degrees
#include <iostream> #include <cmath> #define PI 3.141592654 using namespace std; int main() { int x = 14; double result; result = atan(x); cout << "atan(x) = " << result << " radian" << endl; //Output in gradi cout << "atan(x) = " << result*180/3.1415 << " gradi" << endl; return 0; }
Quando si esegue il programma, l'output è:
atan(x) = 1.49949 radian atan(x) = 85.9169 gradi