无法在C ++中减去long double形式的long double

Question

Whenever I do subtraction from long double, I get incorrect answer

long double Runge(long double a, long double b, int m)
{
long double R;
R=(b-a)/((2^m)-1);
cout<<setprecision(16)<<R<<endl;
return(R);
}

For example, when a=0.53733 b=0.53736 m=2 i get R equal to -2.805572983821669e-006

Any ideas why this happen?

Answer 1

As noted in a comment, the ^ operator doesn't do what you expect. It's actually the bitwise XOR operator, what you are looking for it the pow function.