除法運(yùn)算中注意：
如果相除的兩個(gè)數(shù)都是整數(shù)的話，則結(jié)果也為整數(shù)，小數(shù)部分省略，如8/3 = 2;
而兩數(shù)中有一個(gè)為小數(shù)，結(jié)果則為小數(shù)，如：9.0/2 = 4.500000。
mtianyan： 取余運(yùn)算中注意：
該運(yùn)算只適合用兩個(gè)整數(shù)進(jìn)行取余運(yùn)算，如：10%3 = 1；
mtianyan： nos： 而10.0%3則是錯(cuò)誤的；運(yùn)算后的符號(hào)取決于被模數(shù)的符號(hào)，如（-10）%3 = -1;而10%（-3） = 1;mtianyan： %%表示這里就是一個(gè)%符。
注：C語(yǔ)言中沒(méi)有乘方這個(gè)運(yùn)算符，也不能用×， ÷等算術(shù)符號(hào)。
自增與自減運(yùn)算符
自增運(yùn)算符為++，其功能是使變量的值自增1
自減運(yùn)算符為--，其功能是使變量值自減1。
它們經(jīng)常使用在循環(huán)中。自增自減運(yùn)算符有以下幾種形式：
賦值運(yùn)算符
C語(yǔ)言中賦值運(yùn)算符分為簡(jiǎn)單賦值運(yùn)算符和復(fù)合賦值運(yùn)算符
簡(jiǎn)單賦值運(yùn)算符=號(hào)了，下面講一下復(fù)合賦值運(yùn)算符：
復(fù)合賦值運(yùn)算符就是在簡(jiǎn)單賦值符=之前加上其它運(yùn)算符構(gòu)成。
例如+=、-=、*=、/=、%=分析：定義整型變量a并賦值為3，a += 5;這個(gè)算式就等價(jià)于a = a+5; 將變量a和5相加之后再賦值給a
注意：復(fù)合運(yùn)算符中運(yùn)算符和等號(hào)之間是不存在空格的。
關(guān)系運(yùn)算符
C語(yǔ)言中的關(guān)系運(yùn)算符：
關(guān)系表達(dá)式的值是真和假，在C程序用整數(shù)1和0表示。
注意：》=， 《=， ==， ！=這種符號(hào)之間不能存在空格。
邏輯運(yùn)算符
C語(yǔ)言中的邏輯運(yùn)算符：
邏輯運(yùn)算的值也是有兩種分別為真和假，C語(yǔ)言中用整型的1和0來(lái)表示。其求值規(guī)則如下：
與運(yùn)算 &&參與運(yùn)算的兩個(gè)變量都為真時(shí)，結(jié)果才為真，否則為假。例如：5》=5 && 7》5 ，運(yùn)算結(jié)果為真；
或運(yùn)算 ||參與運(yùn)算的兩個(gè)變量只要有一個(gè)為真，結(jié)果就為真。兩個(gè)量都為假時(shí)，結(jié)果為假。例如：5》=5||5》8，運(yùn)算結(jié)果為真；
非運(yùn)算！參與運(yùn)算的變量為真時(shí)，結(jié)果為假；參與運(yùn)算量為假時(shí)，結(jié)果為真。例如：！（5》8），運(yùn)算結(jié)果為真。
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