What are the rules governing C++ single and double precision mixed calculations?

Question

For example, these variables:

result (double)
a (double)
b (float)
c (float)
d (double)

A simple calculation:

result = a *          


        

Answer 1

Following order of operations, each sub-expression is converted to the type of it's (not sure of the term here, dominant perhaps?) type. double is dominant over float, so:

(b + c) // this is evaluated as a float, since both b and c are floats
a * (b + c) // this is evaluated as a double, since a is a double
a * (b + c) * d // this is evaluated as a double, since both "a * (b + c)" and d are doubles