Question

How to use acos() function to get the arc cosine value of N in C++

Answer 1

#include <iostream>
#include <cmath>      

using namespace std;

int main()
{
	cout << "acos(.5) = " << acos(.5) << endl;

	double ac = acos(.9);
	cout << "acos(.9) = " << ac << endl;

	return 0;
}


/*
run:

acos(.5) = 1.0472
acos(.9) = 0.451027

*/

 

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Answer 2

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	cout << "acos(0) = " << acos(0) << endl;
	cout << "acos(-1) = " << acos(-1) << endl;
	cout << "acos(1) = " << acos(1) << endl;
	cout << "acos(0.5) = " << acos(0.5) << endl;

	return 0;
}

/*
run:

acos(0) = 1.5708
acos(-1) = 3.14159
acos(1) = 0
acos(0.5) = 1.0472

*/

 

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