invalid operands of typs ‘double’ & ‘double’ to binary ‘operator^’

[MWH]

#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main()
{
int A,B,C,t,theta;
float pi=22/7;
theta=140.0;
t=theta/180.0*pi;
C=sqrt(A^2+B^2-2*A*B*cos(theta));
cout<<C<<endl;
return 0;
}

um havin error massage "test2.cpp:11: error: invalid operands of types ‘double’ and ‘double’ to binary ‘operator^’ " can somebody tell me what's wrong in here.

[kevinkjt2000]

A and B need to be double not int

[Disch]

^ is not the power operator. It's a binary XOR operator. IE: A^2 does not square A, instead it toggles bit 1 of A.

C++ does not have a built in power operator. For squaring stuff, you're betting off multiplying it by itself:

sqrt( A*A + B*B - 2*A*B*cos(theta) );

[kevinkjt2000]

Ooops I guess that is what I get for learning other programming languages at the same time. If you need a power other than 2 use doubles with the math pow function.
http://cplusplus.com/reference/clibrary/cmath/pow/

[Disch]

heh.

I intentionally didn't mention pow() because it's so often abused.

Don't use pow if you can [reasonably] avoid it. Even raising things to the 3rd or 4th power you're probably better off multiplying. pow is for tricky stuff like raising to 2.16.