第2章C數(shù)據(jù)類型

1、1實(shí)用精品課件ppt2021-11-22/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-23/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-24/26#include /*函數(shù)功能函數(shù)功能：計(jì)算兩個整數(shù)相加之和計(jì)算兩個整數(shù)相加之和 入口參數(shù)入口參數(shù)：整型數(shù)據(jù)整型數(shù)據(jù)a和和b 返回值：返回值： 整型數(shù)整型數(shù)a和和b之和之和*/int add(int a, int b)return (a + b);/*主函數(shù)主函數(shù)*/main()int x, y, sum = 0;printf(input two integers:);scanf(%d%d, &x, &y); /*輸入兩個

2、整型數(shù)輸入兩個整型數(shù)x和和y*/sum = add(x, y); /*調(diào)用函數(shù)調(diào)用函數(shù)add計(jì)算計(jì)算x和和y相加之和相加之和*/printf(sum = %dn, sum); /*輸出輸出x和和y相加之和相加之和*/ 并列的兩個函數(shù)并列的兩個函數(shù)其中主函數(shù)是其中主函數(shù)是程序的入口程序的入口程序注釋程序注釋編譯預(yù)處理命令編譯預(yù)處理命令實(shí)用精品課件實(shí)用精品課件ppt2021-11-25/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-26/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-27/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-28/26如如 如如 長整型長整型無符號整型無符號整

3、型八進(jìn)制八進(jìn)制十六進(jìn)制十六進(jìn)制單精度單精度實(shí)型實(shí)型長雙精度長雙精度實(shí)型實(shí)型十進(jìn)制小十進(jìn)制小數(shù)數(shù)指數(shù)形指數(shù)形式式十進(jìn)制十進(jìn)制實(shí)用精品課件實(shí)用精品課件ppt2021-11-29/26如如 如如 實(shí)用精品課件實(shí)用精品課件ppt2021-11-210/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-211/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-212/26結(jié)果會是什么？結(jié)果會是什么？實(shí)用精品課件實(shí)用精品課件ppt2021-11-213/26運(yùn)算規(guī)則：運(yùn)算規(guī)則： 語法：語法： 規(guī)則：規(guī)則： 左值和右值類型一致左值和右值類型一致valid example:invalid example:in

4、t x; int y;x = 12;y = 5.75;實(shí)用精品課件實(shí)用精品課件ppt2021-11-214/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-215/26數(shù)據(jù)類型數(shù)據(jù)類型基本類型基本類型構(gòu)造類型構(gòu)造類型指針類型指針類型 intint * *無類型無類型 voidvoid整型整型實(shí)型（浮點(diǎn)型）實(shí)型（浮點(diǎn)型）字符型字符型 charchar枚舉類型枚舉類型 enumenum 布爾布爾 boolbool 數(shù)組類型數(shù)組類型 intint a 5 a 5 結(jié)構(gòu)體類型結(jié)構(gòu)體類型共用體類型共用體類型單精度實(shí)型單精度實(shí)型雙精度實(shí)型雙精度實(shí)型基本整型基本整型 intint長整型長整型 longlo

5、ng短整型短整型無符號整型無符號整型 unsigned unsigned intint長雙精度實(shí)型長雙精度實(shí)型實(shí)用精品課件實(shí)用精品課件ppt2021-11-216/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-217/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-218/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-219/26most significant bit (msb) is sign(最高位為符號位最高位為符號位)實(shí)用精品課件實(shí)用精品課件ppt2021-11-220/26英文稱謂英文稱謂中文稱謂中文稱謂換算方法換算方法bit(b)bit(b)位（位（比特）比特）byte

6、(b)byte(b)字節(jié)字節(jié)1 b = 8 b1 b = 8 bkilobyte(kb)kilobyte(kb)千字節(jié)千字節(jié)1 kb = 1 024 b1 kb = 1 024 bmegabyte(mb)megabyte(mb)兆兆字節(jié)字節(jié)1 mb = 1 024 kb1 mb = 1 024 kbgigabyte(gb)gigabyte(gb)吉字節(jié)吉字節(jié)1 gb = 1 024 mb1 gb = 1 024 mbterabyte(tb)terabyte(tb)太字節(jié)太字節(jié)1 tb = 1 024 gb1 tb = 1 024 gb實(shí)用精品課件實(shí)用精品課件ppt2021-11-221/26實(shí)

7、用精品課件實(shí)用精品課件ppt2021-11-222/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-223/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-224/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-225/26#include #include main()main() printf(data type number of bytesn);printf(data type number of bytesn);printf(- -n);printf(- -n);printf(char printf(char %dn, sizeof(char);%dn, sizeof(char

8、);printf(int printf(int %dn, sizeof(int); %dn, sizeof(int);printf(short int printf(short int %dn, sizeof(short);%dn, sizeof(short);printf(long int printf(long int %dn, sizeof(long);%dn, sizeof(long);printf(float printf(float %dn, sizeof(float);%dn, sizeof(float);printf(double printf(double %dn, sizeof(double);%dn, sizeof(double); 實(shí)用精品課件實(shí)用精品課件ppt2021-11-226/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-227/26實(shí)用精品課件實(shí)用精品課件ppt2021-11-228/26example:int a, b;float x, y;. . . a = b = 0;x = y = 100.0;b?a? x? y?00100.0100.0實(shí)用精品課件實(shí)用精品課件ppt2021-11-229/26【例例2.3】#include main()float a;double b;a = 1234