functions

[Dorian Mayorquin]

Hi guys, i'm having trouble with this code:

#include<iostream>
#include<cmath>

using namespace std;

int main()

{
double a = 8;


cout << "This is tangent of 8\n"<< tan(a) <<endl;

return 0;
}

it keeps giving me the wrong result it says that is: -6.79971

[Arndt]

Hi guys, i'm having trouble with this code:

#include<iostream>
#include<cmath>

using namespace std;

int main()

{
double a = 8;


cout << "This is tangent of 8\n"<< tan(a) <<endl;

return 0;
}

it keeps giving me the wrong result it says that is: -6.79971

It's probably correct. The argument is in radians, not degrees.

[Lootbox]

Arndt is correct. A good place to look these types of things up is at http://www.cplusplus.com/reference/. The entry for the tan function (here (http://www.cplusplus.com/reference/clibrary/cmath/tan/)) explains what type of parameter it expects.

[WRDN]

tan(8.0) is equal to -6.79971, as the parameter provided is radians, as Arndt noted.

If you want to convert between them:

Radians = Degrees * (PI/180)
Degrees = Radians * (180/PI)
PI = 3.14159265