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The assignment operator,
=, like all operators in C++,
produces a value. By convention, the value produced is the
same as the value assigned. Thus, the value of the expression
y = 5 is 5.
Accordingly, assignment expressions can appear as subexpressions
nested inside larger expressions.
In the following assignment expression, for example, the
assignment expression, y = 5, which assigns a value to
y, appears inside a larger assignment expression, which
assigns a value to x as well:
x = (y = 5)
When the assignment expression is evaluated, 5 is assigned
to y first; then, the value of the subexpression, which is
also 5, is assigned to x.