Combining Different Types in One Expression
Recall that even the most complicated expressions involving binary operators can be divided into sub-expressions, each consisting of two operands and an operator; and remember how operator precedence and associativity rules determine to which operand each operator is applied. Along with the values passed through the various levels of this sub-expression hierarchy are also the types of these values, as illustrated in Figure 7.3.
Figure 7.3. Types from sub-expressions transferred through expression hierarchy.
Consequently, if we can somehow determine the type of any expression involving just two operands ...
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