Arithmetic and Operators

Math in C++

cout << 10 + 3;   // 13  addition
cout << 10 - 3;   // 7   subtraction
cout << 10 * 3;   // 30  multiplication
cout << 10 / 3;   // 3   integer division (truncates!)
cout << 10.0/3;   // 3.333...  float division
cout << 10 % 3;   // 1   remainder (modulo)

Integer vs Float Division

int a = 7, b = 2;
cout << a / b;           // 3  (integer, drops decimal)
cout << (double)a / b;   // 3.5

Shorthand

x += 5;  x -= 2;  x *= 3;  x /= 4;
x++;     ++x;     x--;     --x;

Your Task

Write hypotenuse(double a, double b) using the Pythagorean theorem.
Formula: c = sqrt(a*a + b*b). Use #include <cmath>.