I'm a beginner in C++, we were just starting the course (CSC 201) before oga Corona sent us back home. Incase you have knowledge in C++, I need your help please.
Is this a logic error, or the C++ was designed that way;
sin 30 = 0.5 normally, but here in my program, I'm getting -0.98803(negative number), same goes with sin 60.
Here is the program below, incase u have an idea, please help a brother.

#include <iostream>
#include <cmath>
using namespace std;
int main ( )
{
double x = 30.0;
double y = 2.0;
cout << sin (x) <<endl;
cout << x/y <<endl;
// I want the program to print 0.5 and 15.
// but I'm getting something else.
return 0;
}

so please what could be the problem?

Sin and Cos functions take the angle parameter in radian. You should convert the angle to radian first before passing into the sin/cos function.

I don't really know c++, but in Java, you'll use Math.toRadian(angle in degree).

.

jpawjpaw:
I'm a beginner in C++, we were just starting the course (CSC 201) before oga Corona sent us back home. Incase you have knowledge in C++, I need your help please.
Is this a logic error, or the C++ was designed that way;
sin 30 = 0.5 normally, but here in my program, I'm getting -0.98803(negative number), same goes with sin 60.
Here is the program below, incase u have an idea, please help a brother.

#include <iostream>
#include <cmath>
using namespace std;
int main ( )
{
double x = 30.0;
double y = 2.0;
cout << sin (x) <<endl;
cout << x/y <<endl;
// I want the program to print 0.5 and 15.
// but I'm getting something else.
return 0;
}

so please what could be the problem?

I guess you are a futo student?

Scout60:

I guess you are a futo student?

Nop, why did u say so?

Davechuks360:
Sin and Cos functions take the angle parameter in radian. You should convert the angle to radian first before passing into the sin/cos function.

I don't really know c++, but in Java, you'll use Math.toRadian(angle in degree).

okay sir, thank u.

Scout60:

I guess you are a futo student?

#Mautech

jpawjpaw:
Nop, why did u say so?

Because of the course code.... are you learning c++ to know or just pass your exams?

Scout60:


Because of the course code....
are you learning c++ to know or just pass your exams?

Oooh, ok........
I'm learning to know oo, not just pass my exams;
learning to just pass exams is not the way out. I have done that in my 100L, and then it was Java, I crammed to pass, and now I've forgot almost everything in Java; so I can't afford to repeat that in c++.
I want to become a guru in it.

jpawjpaw:


Oooh, ok........
I'm learning to know oo, not just pass my exams;
learning to just pass exams is not the way out. I have done that in my 100L, and then it was Java, I crammed to pass, and now I've forgot almost everything in Java; so I can't afford to repeat that in c++.
I want to become a guru in it.

Java and c++ is always complex for beginners. If you want to become in c++ then find a personal tutor that will guide you but if you want to learn on your own, I suggest you start with python which is beginner- friendly. With python, u will understand how programming works and you will put the ideas towards learning c++

Scout60:


Java and c++ is always complex for beginners. If you want to become in c++ then find a personal tutor that will guide you but if you want to learn on your own, I suggest you start with python which is beginner- friendly. With python, u will understand how programming works and you will put the ideas towards learning c++

wow thanks for the idea, I really appreciate.

I will do as you said.