linux c編程常用api接口 函數(shù)

1、11字符測試篇字符測試篇22字符串轉換篇103內存控制篇174日期時間篇225內存及字符串操作篇286常用數(shù)學函數(shù)篇457用戶組篇568數(shù)據結構及算法篇789文件操作篇8510文件內容操作篇9411進程操作篇10912文件權限控制篇13013信號處理篇15314接口處理篇16615環(huán)境變量篇18416終端控制篇18635.1bcmp（比較內存內容）.............................................

2、................................................285.2bcopy（拷貝內存內容）............................................................................................285.3bzero（將一段內存內容全清為零）.......................................

3、..................................295.4index（查找字符串中第一個出現(xiàn)的指定字符）.....................................................295.5memccpy（拷貝內存內容）.....................................................................................

4、.305.6memchr（在某一內存范圍中查找一特定字符）....................................................305.7memcmp（比較內存內容）.......................................................................................315.8memcpy（拷貝內存內容）..............

5、..........................................................................325.9memmove（拷貝內存內容）.....................................................................................335.10memset（將一段內存空間填入某值）................

6、.....................................................335.11rindex（查找字符串中最后一個出現(xiàn)的指定字符）...............................................345.12strcasecmp（忽略大小寫比較字符串）.............................................................

7、.......345.13strcat（連接兩字符串）.............................................................................................355.14strchr（查找字符串中第一個出現(xiàn)的指定字符）....................................................355.15strcmp（比較字符串

8、）...............................................................................................365.16strcoll（采用目前區(qū)域的字符排列次序來比較字符串）........................................375.17strcpy（拷貝字符串）...............................

9、.................................................................375.18strcspn（返回字符串中連續(xù)不含指定字符串內容的字符數(shù)）..............................385.19strdup（復制字符串）......................................................................

10、..........................385.20strlen（返回字符串長度）.........................................................................................395.21strncasecmp（忽略大小寫比較字符串）.......................................................

11、...........405.22strncat（連接兩字符串）...........................................................................................405.23strncpy（拷貝字符串）.............................................................................

12、.................415.24strpbrk（查找字符串中第一個出現(xiàn)的指定字符）..................................................415.25strrchr（查找字符串中最后出現(xiàn)的指定字符）.......................................................425.26strspn（返回字符串中連續(xù)不含指定字符串內容的字符數(shù)）..

13、..............................435.27strstr（在一字符串中查找指定的字符串）..............................................................435.28strtok（分割字符串）.................................................................................

14、...............446常用數(shù)學函數(shù)篇......................................................................................................................456.1abs（計算整型數(shù)的絕對值）..........................................................

15、..........................456.2acos（取反余弦函數(shù)數(shù)值）......................................................................................456.3asin（取反正弦函數(shù)值）.......................................................................

16、....................466.4atan（取反正切函數(shù)值）...........................................................................................466.5atan2（取得反正切函數(shù)值）.......................................................................

17、..............476.6ceil（取不小于參數(shù)的最小整型數(shù)）........................................................................486.7cos（取余玄函數(shù)值）...............................................................................................

18、.486.8cosh（取雙曲線余玄函數(shù)值）..................................................................................496.9exp（計算指數(shù)）.......................................................................................................

19、.496.10frexp（將浮點型數(shù)分為底數(shù)與指數(shù)）.....................................................................506.11ldexp（計算2的次方值）.........................................................................................506.12log（計算以e為底

20、的對數(shù)值）................................................................................516.13log10（計算以10為底的對數(shù)值）.........................................................................526.14pow（計算次方值）......................