2-dimensional vector and a 3-dimensional vector program

[lozovic]

i am trying to write a program that could output the magnitudes of a 2-dimensional vector and a 3-dimensional vector, however im stuck at this point

#include <iostream>
using std::cout;
using std::endl;
#include <cmath>
double magnitude(double x, double y);
double magnitude(double x, double y, double z);
int main() {
double mag2D, mag3D;
mag2D = magnitude(3,4);
mag3D = magnitude(3,4,5);
cout<<"magnitude of 2D vector = " << mag2D << endl;
cout<<"magnitude of 3D vector = " << mag3D << endl;
return 0;
}

can anyone help me?

[hamsterman]

You mean return sqrt(x*x+y*y); ?

[lozovic]

yes pretty much but how do I include that into the program?
also I dont understand y the current on always gives me errors
thx!

[hamsterman]

Just inside {}

double magnitude(double x, double y){
   return sqrt(x*x+y*y);
}

main() is a function, and you know how to write main(), so that means how to write any function, right?.

What errors are you getting (except "undefined reference to magnitude" or something like that)?

[lozovic]

hi yeh i fixed it thx!! (silly rookie error, missed a semi colon )
however just one last question what does the sqrt function does?
could i possibly write a function without using it?

[LB]

sqrt(x) is short for Square Root of x. You can write a function any way you like, it's just this specific function that you will want to use the sqrt() function for.