Member Avatar for zaharaandfarah

hi. 2 all
anyone can tell what is the wrong with this code? the result of this program is :
cos(60)=-0.952413
sin(60)=-0.304811

#include <iostream.h>
#include <math.h>
main()
{
 float x,y,z;
y=cos(60);
z=sin(60);
cout<<"cos(60)="<<y<<endl;
cout<<"sin(60)="<<z<<endl;
}

cheers

Edited by peter_budo because: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks)
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  • Latest Post Latest Post by n.utiu
Member Avatar for Obsidian_496

I don't see a problem there. I've been using Borland C++ for my home assignments, and your code compiled on it without errors. Then again, it is an outdated compiler, and you are probably using a different one.

Maybe you want to put getch() in the end, so that window does not close, when program is finished, and you can view the results?

Member Avatar for jonsca

The math.h functions take an angle in radians. Use the conversion pi radians is to 180 degrees to convert your angles before sending them in.

commented: And the one that solves this mystery +5
Member Avatar for n.utiu

math.h trigonometric functions take parameters in radians. To convert radians to degrees :
cos (60 degrees) is equivalent to

cos (PI*60/180)

PI - predefined constant in math.h

Edited by n.utiu because: n/a
Member Avatar for jonsca

PI - predefined constant in math.h

I think it's M_PI (although it may be redefined elsewhere).

Member Avatar for n.utiu

I think it's M_PI (although it may be redefined elsewhere).

Yeah, sorry. The constant in cmath is M_PI.

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