Functions

Functions as Black Boxes

Many functions have input values or parameters that are transferred or passed into the function.
- The x in y = sqrt(x);
- Both the x and the y in z = pow(x, y);
- Could be an expression as in sqrt(b * b - 4 * a * c);
Many functions have output or return values.
- The y in y = sqrt(x);
Both parameters and return values are a particular type.
- You cannot compute sqrt("Harry");
- You cannot assign string s = sqrt(5.5);