_1_常用運(yùn)算符及優(yōu)先級ppt課件

1、Lesson 1常用運(yùn)算符及優(yōu)先級常用運(yùn)算符及優(yōu)先級mtysoft1632整型與格式符#include #include main()main() int a, b, c; int a, b, c; a = 1; a = 1; b = 2; b = 2; c = a + b; c = a + b; printf(c = %d, c); printf(c = %d, c); a a1 1b b2 2c c3 3c = 3c = 33賦值運(yùn)算符int a, b, c;int a, b, c;a = 1;a = 1;b = 2;b = 2;a = a + b;a = a + b;b = a + b;

2、b = a + b;c = a + b;c = a + b;黃建語錄一：變量某一時刻只能保存黃建語錄一：變量某一時刻只能保存一個值。一個值。a a1 1b b2 2c c8 83 35 54算術(shù)運(yùn)算符乘法、除法和求余的運(yùn)算乘法、除法和求余的運(yùn)算優(yōu)先級高于加法和減法。優(yōu)先級高于加法和減法。減法減法加法加法乘法乘法除法除法求余求余- -* */ /% %+ +5求余運(yùn)算：求余運(yùn)算：a = 7 % 4; b = -7 % 4;a = 7 % 4; b = -7 % 4;c = 7 % -4; d = -7 % -4;c = 7 % -4; d = -7 % -4;e = 4 % 7; f = 40

3、% 70;e = 4 % 7; f = 40 % 70;黃氏定理 一黃氏定理一：兩個整數(shù)進(jìn)行算術(shù)運(yùn)算黃氏定理一：兩個整數(shù)進(jìn)行算術(shù)運(yùn)算結(jié)果還是整數(shù)。公式表示：結(jié)果還是整數(shù)。公式表示：7 / 4 7 / 4 = 1= 12019.4.142019.4.14表達(dá)式表達(dá)式3.6-5/2+1.2+5%23.6-5/2+1.2+5%2的值是的值是 A)4.3 B)4.8 C)3.3 D)3.8 A)4.3 B)4.8 C)3.3 D)3.83 -33 -33 -33 -34 404 406 int a=3, b=3, c=3; int a=3, b=3, c=3; int a, b, c; int a,

4、b, c; a = 3; b = 3; c = 3; a = 3; b = 3; c = 3; int a, b, c; int a, b, c; a = b = c = 3; a = b = c = 3; int a = b = c = 3; int a = b = c = 3;變量賦值正確正確正確正確正確正確錯誤錯誤7自增自減運(yùn)算符b = a+;相當(dāng)于：相當(dāng)于：b = a;a+;先取值，后自增先取值，后自增b = +a;相當(dāng)于：相當(dāng)于：+a;b = a;先自增，后取值先自增，后取值8關(guān)系運(yùn)算符小于或等于小于或等于 = = =小于小于 等于等于 =關(guān)系關(guān)系運(yùn)算運(yùn)算9邏輯運(yùn)算符Diagram

5、2Diagram3真變假，假變真真變假，假變真全假才假全假才假全真才真全真才真 Diagram 2Diagram 3非 !與 &或 |10C語言常見運(yùn)算符優(yōu)先級口訣11運(yùn)算符優(yōu)先級.簡稱簡稱 含義含義運(yùn)算符運(yùn)算符數(shù)目數(shù)目結(jié)合結(jié)合單單單目單目+, -, !+, -, !單目單目算算算術(shù)算術(shù)* *, /, %, /, %雙目雙目+, -+, -雙目雙目關(guān)關(guān)關(guān)系關(guān)系, =, , , =, , =雙目雙目=, !=, !=雙目雙目邏邏邏輯邏輯&雙目雙目|雙目雙目條條條件條件? :? :三目三目賦賦賦值賦值=,+=,-=,=,+=,-=,* *=,/=,%=,/=,%=雙目雙目逗逗逗號逗

6、號, ,12運(yùn)算符的右結(jié)合性 單目、條件和賦值運(yùn)算符具有右結(jié)合性，如：單目、條件和賦值運(yùn)算符具有右結(jié)合性，如： 單目運(yùn)算符：單目運(yùn)算符：!a+;!a+; 相當(dāng)于：相當(dāng)于：!(a+);!(a+); 條件運(yùn)算符：條件運(yùn)算符：a ? b : c ? d : e;a ? b : c ? d : e; 相當(dāng)于：相當(dāng)于：a ? b : (c ? d : e);a ? b : (c ? d : e); 賦值運(yùn)算符：賦值運(yùn)算符：a = b = c;a = b = c; 相當(dāng)于：相當(dāng)于：a = (b = c);a = (b = c); 其它運(yùn)算符左結(jié)合，如：其它運(yùn)算符左結(jié)合，如： 算術(shù)運(yùn)算符：算術(shù)運(yùn)算符：a + b - c;a + b - c; 相當(dāng)于：相當(dāng)于：(a + b) - c;(a + b) - c;13本課小結(jié)VC+ 6.0 VC+ 6.0 開發(fā)環(huán)境開發(fā)環(huán)境C C語言的特點語言的特點C C程序的書寫格式程序的書寫格式運(yùn)算符的優(yōu)先級運(yùn)算符的優(yōu)先級運(yùn)算符的結(jié)合性運(yùn)算符的結(jié)合性14課后題：整數(shù)分離及合并將兩個兩位的正整數(shù)將兩個兩位的正整數(shù)a a、b b合并形成一個整合并形成一個整數(shù)放在數(shù)放在c c中：將中：將a a的十位和個位數(shù)依次放在的十位和個位數(shù)依次放在c c的千位和十位上，的千