Question

How to use tan() function to compute the tangent of an angle of N radians in C++

Answer 1

#include <iostream>
#include <cmath>

using namespace std;

#define PI 3.14159265

int main()
{
	cout << "tan(45 * PI / 180.0) = " << tan(45 * PI / 180.0) << endl;
	cout << "tan(3 * PI / 4) = " << tan(3 * PI / 4) << endl;
	cout << "tan(5 * PI / 4) = " << tan(5 * PI / 4) << endl;
	cout << "tan(7 * PI / 4) = " << tan(7 * PI / 4) << endl;
	cout << "tan(PI / 4) = " << tan(PI / 4) << endl;
	cout << "tan(0.0) = " << tan(0.0) << endl;
	cout << "tan(-0.0) = " << tan(-0.0) << endl;

	return 0;
}

/*
run:

tan(45 * PI / 180.0) = 1
tan(3 * PI / 4) = -1
tan(5 * PI / 4) = 1
tan(7 * PI / 4) = -1
tan(PI / 4) = 1
tan(0.0) = 0
tan(-0.0) = -0

*/

 

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