midka228

[dm0000]

Given two integers a and b – sides of triangle. You need to write a function that calculates the hypotenuse
of the triangle.

[seeplus]

Do you know the Pythagorean theorem? Is it assumed that the triangle is right angled?

[jonnin]

sqrt() is in <cmath>
and if its not a right triangle, sin, cos, etc are also in cmath -- they work in radians.
exponents can be done via pow(), but here, its better to just say a*a or b*b
you can look at the reference on this site for what else is lurking in cmath header.