Page 47 - PIC18F4550微處理機C語言設計實務

૵ሔଡ଼ΥႧԊձ C ႧԊ 1

Չʕᄳίᜊᅰ a ʘۃٙ ++ ၾ –– ఱ݊჈ᄣ༶ၑɿ€Increment operatorၾ჈ಯ༶
ၑɿ€Decrement operatorf

჈ᄣא჈ಯ༶ၑɿᅠᄳίᜊᅰʘۃאʘܝdՇ٫݊Ϟࢨйٙdਗ਼჈ᄣ€჈ಯ༶

ၑɿᅠᄳίᜊᅰۃࣛdڌͪ΋ਗ਼ᜊᅰٙ࠽̋€ಯ1d್ܝΎෂΫᜊᅰٙ࠽dਗ਼჈ᄣ
€჈ಯ༶ၑɿᅠᄳίᜊᅰʘܝdڌͪ΋ෂΫᜊᅰ࠽d್ܝΎ࿁ᜊᅰ̋€ಯ1f

Էνj

int a = 0; int c = 0;
c = ++a; /* ޴຅׵ a=a+1; c=a; ΋჈ᄣΎෂഗ cdഐ؈ c=1da=1f
c = --a; /* ޴຅׵ a=a-1; c=a; ΋჈ಯΎෂഗ cdഐ؈ c=0da=0f

int a = 0; int c = 0;
c = a++; /* ഃ׵ c=a; a=a+1; ΋ෂഗ c Ύ჈ᄣdc=0da=1f
c = a--; /* ഃ׵ c=a; a=a-1; ΋ෂഗ c Ύ჈ಯdc=1da=0f

■ 指定運算子（Assignment operator）

ܸ֛༶ၑɿdҢࡁʊ຾޶ཀɓࡈܸ֛༶ၑɿٜટண֛ =dԫྼɪܸ֛༶ၑɿᒔϞ

˸ɨٙ఻ࡈj

運算子符號 範例 功能說明
+= a += b a = a + b
–= a –= b a = a – b

*= a *= b a = a * b
/= a /= b a = a / b€̥՟ਠ

%= a %= b a = a % b€̥՟ቱᅰ
&= a &= b a = a & b
|= a |= b a = a | b
^= a ^= b a = a ^ b

<<= a <<= b a = a << b // ਗ਼ a ̸୅ b ࡈЗʩ್ܝπΫ a
>>= a >>= b a = a >> b // ਗ਼ a ̛୅ b ࡈЗʩ್ܝπΫ a

வԬ༶ၑɿ߰ᄳίɓৎdɦӚϞ͜ʃܼ໮ਜཞ݊ϞՉᎴ΋නҏdΝɓᗳۨٙ༶ၑ
ɿᄳίۃࠦٙึ΋ੂБdШ݊Ԩʔ݊הϞᄳίۃࠦٙ༶ၑɿ೻όேึ΋ੂБdʔΝᗳ

ۨٙ༶ၑɿึ࣬ኽ̴ٙᎴ΋නҏԸੂБdה˸ܔᙄᄳ೻όᒔ݊ࠅ୦࿕͜ʃܼ໮ਗ਼Іʊ
ซࠅٙᎴ΋නҏਂλਜཞd˸еੂБഐ؈ၾ຅ڋணซٙʔΝdֵɨఱΐ̈வԬ੬͜༶
ၑɿୌ໮ٙᎴ΋නҏf

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