c++常用字符串操作函数

《c++常用字符串操作函数》由会员分享，可在线阅读，更多相关《c++常用字符串操作函数（18页珍藏版）》请在金锄头文库上搜索。

1、c+c+常用字符串操作函数常用字符串操作函数函数名函数名: : stpcpystpcpy功 能: 拷贝一个字符串到另一个用 法: char *stpcpy(char *destin, char *source);程序例:#include #include int main(void)char string10;char *str1 = “abcdefghi“;stpcpy(string, str1);printf(“%sn“, string);return 0;函数名函数名: : strcatstrcat功 能: 字符串拼接函数用 法: char *strcat(char *destin, c

2、har *source);程序例:#include #include int main(void)char destination25;char *blank = “ “, *c = “C+“, *Borland = “Borland“;strcpy(destination, Borland);strcat(destination, blank);strcat(destination, c);printf(“%sn“, destination);return 0;函数名函数名: : strchrstrchr功 能: 在一个串中查找给定字符的第一个匹配之处用 法: char *strchr(ch

3、ar *str, char c);程序例:#include #include int main(void)char string15;char *ptr, c = r;strcpy(string, “This is a string“);ptr = strchr(string, c);if (ptr)printf(“The character %c is at position: %dn“, c, ptr-string);elseprintf(“The character was not foundn“);return 0;函数名函数名: : strcmpstrcmp功 能: 串比较用 法:

4、int strcmp(char *str1, char *str2);看 Asic 码，str1str2，返回值 0；两串相等，返回 0程序例:#include #include int main(void)char *buf1 = “aaa“, *buf2 = “bbb“, *buf3 = “ccc“;int ptr;ptr = strcmp(buf2, buf1);if (ptr 0)printf(“buffer 2 is greater than buffer 1n“);elseprintf(“buffer 2 is less than buffer 1n“);ptr = strcmp(

5、buf2, buf3);if (ptr 0)printf(“buffer 2 is greater than buffer 3n“);elseprintf(“buffer 2 is less than buffer 3n“);return 0;函数名函数名: : strncmpistrncmpi功 能: 将一个串中的一部分与另一个串比较, 不管大小写用 法: int strncmpi(char *str1, char *str2, unsigned maxlen);程序例:#include #include int main(void)char *buf1 = “BBB“, *buf2 = “

6、bbb“;int ptr;ptr = strcmpi(buf2, buf1);if (ptr 0)printf(“buffer 2 is greater than buffer 1n“);if (ptr #include int main(void)char string10;char *str1 = “abcdefghi“;strcpy(string, str1);printf(“%sn“, string);return 0;函数名函数名: : strcspnstrcspn功 能: 在串中查找第一个给定字符集内容的段用 法: int strcspn(char *str1, char *str

7、2);程序例:#include #include #include int main(void)char *string1 = “1234567890“;char *string2 = “747DC8“;int length;length = strcspn(string1, string2);printf(“Character where strings intersect is at position %dn“, length);return 0;函数名函数名: : strdupstrdup功 能: 将串拷贝到新建的位置处用 法: char *strdup(char *str);程序例:#

8、include #include #include int main(void)char *dup_str, *string = “abcde“;dup_str = strdup(string);printf(“%sn“, dup_str);free(dup_str);return 0;函数名函数名: : stricmpstricmp功 能: 以大小写不敏感方式比较两个串用 法: int stricmp(char *str1, char *str2);程序例:#include #include int main(void)char *buf1 = “BBB“, *buf2 = “bbb“;in

9、t ptr;ptr = stricmp(buf2, buf1);if (ptr 0)printf(“buffer 2 is greater than buffer 1n“);if (ptr #include int main(void)char *buffer;buffer = strerror(errno);printf(“Error: %sn“, buffer);return 0;函数名函数名: : strcmpistrcmpi功 能: 将一个串与另一个比较, 不管大小写用 法: int strcmpi(char *str1, char *str2);程序例:#include #inclu

10、de int main(void)char *buf1 = “BBB“, *buf2 = “bbb“;int ptr;ptr = strcmpi(buf2, buf1);if (ptr 0)printf(“buffer 2 is greater than buffer 1n“);if (ptr #include int main(void)char *buf1 = “aaabbb“, *buf2 = “bbbccc“, *buf3 = “ccc“;int ptr;ptr = strncmp(buf2,buf1,3);if (ptr 0)printf(“buffer 2 is greater t

11、han buffer 1n“);elseprintf(“buffer 2 is less than buffer 1n“);ptr = strncmp(buf2,buf3,3);if (ptr 0)printf(“buffer 2 is greater than buffer 3n“);elseprintf(“buffer 2 is less than buffer 3n“);return(0);函数名函数名: : strncmpistrncmpi功 能: 把串中的一部分与另一串中的一部分比较, 不管大小写用 法: int strncmpi(char *str1, char *str2);程序

12、例:#include #include int main(void)char *buf1 = “BBBccc“, *buf2 = “bbbccc“;int ptr;ptr = strncmpi(buf2,buf1,3);if (ptr 0)printf(“buffer 2 is greater than buffer 1n“);if (ptr #include int main(void)char string10;char *str1 = “abcdefghi“;strncpy(string, str1, 3);string3 = 0;printf(“%sn“, string);return

13、 0;函数名函数名: : strnicmpstrnicmp功 能: 不注重大小写地比较两个串用 法: int strnicmp(char *str1, char *str2, unsigned maxlen);程序例:#include #include int main(void)char *buf1 = “BBBccc“, *buf2 = “bbbccc“;int ptr;ptr = strnicmp(buf2, buf1, 3);if (ptr 0)printf(“buffer 2 is greater than buffer 1n“);if (ptr #include int main(

14、void)char *string = “abcdefghijklmnopqrstuvwxyz“;char letter = x;printf(“string before strnset: %sn“, string);strnset(string, letter, 13);printf(“string after strnset: %sn“, string);return 0;函数名函数名: : strpbrkstrpbrk功 能: 在串中查找给定字符集中的字符用 法: char *strpbrk(char *str1, char *str2);程序例:#include #include i

15、nt main(void)char *string1 = “abcdefghijklmnopqrstuvwxyz“;char *string2 = “onm“;char *ptr;ptr = strpbrk(string1, string2);if (ptr)printf(“strpbrk found first character: %cn“, *ptr);elseprintf(“strpbrk didnt find character in setn“);return 0;函数名函数名: : strrchrstrrchr功 能: 在串中查找指定字符的最后一个出现用 法: char *str

16、rchr(char *str, char c);程序例:#include #include int main(void)char string15;char *ptr, c = r;strcpy(string, “This is a string“);ptr = strrchr(string, c);if (ptr)printf(“The character %c is at position: %dn“, c, ptr-string);elseprintf(“The character was not foundn“);return 0;函数名函数名: : strrevstrrev功 能: 串倒转用 法: char *strrev(char *str);程序例:#include #include int main(void)char *for