ABL electronic PIC Microcontrollers PIC18 User Manual

Thus, we have 10 different compound assignment operators:

<<=

, and

>>=

. All of these associate from right to left. Spaces

separating compound operators (e.g.

+ =

) will generate error.

Compound assignment has the same effect as

expression1 = expression1 op expression2

except the lvalue

expression1

is evaluated only once. For example,

expression1 += expression2

is the same as

expression1 = expression1 + expression2

Assignment Rules

For both simple and compound assignment, the operands

expression1

and

expression2

must obey one of the following rules:

expression1

is a qualified or unqualified arithmetic type and

expression2

is an arithmetic type.

expression1

has a qualified or unqualified version of a structure or union

type compatible with the type of

expression2

expression1

and

expression2

are pointers to qualified or unqualified

versions of compatible types, and the type pointed to by the left has all the
qualifiers of the type pointed to by the right.

4. Either

expression1

expression2

is a pointer to an object or incomplete

type and the other is a pointer to a qualified or unqualified version of

void

The type pointed to by the left has all the qualifiers of the type pointed to by the
right.

expression1

is a pointer and

expression2

is a null pointer constant.

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