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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.