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1、string.h - string.h文件中函数的详细用法下面为string.h文件中函数的详细用法，附加实例:1、strcpy函数名：stpcpy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, strl);printf(%sn, string);return 0;2、strcat函数名：strcat功能：字符串拼接函数用 法：char *strcat
2、(char *destin, char *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;3、strchr函数名：strchr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(c
3、har *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;4、strcmp函数名：strcmp功能：串比较用 法：int strcmp(
4、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(buf2, buf3);if (ptr 0)
5、printf(buffer 2 is greater than buffer 3n);elseprintf(buffer 2 is less than buffer 3n);return 0;5、strncmpi函数名:strncmpi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 = bbb;int ptr;ptr = strcmpi(buf2, buf1)
6、;if (ptr 0)printf(buffer 2 is greater than buffer 1n);if (ptr 0)printf(buffer 2 is less than buffer 1n);if (ptr = 0)printf(buffer 2 equals buffer 1n);return 0;6、strcpy函数名：strcpy功能：串拷贝用 法:char *strcpy(char *str1, char *str2);程序例：#include #include int main(void)char string10;char *str1 = abcdefghi;str
7、cpy(string, str1);printf(%sn, string);return 0;7、strcspn函数名:strcspn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 *str2);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
8、intersect is at position %dn, length);return 0;8、strdup函数名：strdup功能：将串拷贝到新建的位置处用 法:char *strdup(char *str);程序例：#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:stricmp功能：以大小写不敏感方式比较两个串用 法：int stricmp(cha
9、r *str1, char *str2);程序例：#include #include int main(void)char *buf1 = BBB, *buf2 = bbb;int ptr;ptr = stricmp(buf2, bufl);if (ptr 0)printf(buffer 2 is greater than buffer 1n);if (ptr 0)printf(buffer 2 is less than buffer 1n);if (ptr = 0)printf(buffer 2 equals buffer 1n);return 0;10、strerror函数名：strerr
10、or功能：返回指向错误信息字符串的指针用 法：char *strerror(int errnum);程序例：#include #include int main(void)char *buffer;buffer = strerror(errno);printf(Error: %sn, buffer);return 0;11、strcmpi函数名：strcmpi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 #include int main(void)char *buf1 = BBB, *buf2
11、= bbb;int ptr;ptr = strcmpi(buf2, bufl);if (ptr 0)printf(buffer 2 is greater than buffer 1n);if (ptr 0)printf(buffer 2 is less than buffer 1n);if (ptr = 0)printf(buffer 2 equals buffer 1n);return 0;函数名：strncmp功能：串比较用 法：int strncmp(char *str1, char *str2, int maxlen);程序例：#include #include int main(vo
12、id)char *buf1 = aaabbb, *buf2 = bbbccc, *buf3 = ccc;int ptr;ptr = strncmp(buf2,buf1,3);if (ptr 0)printf(buffer 2 is greater than 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 buf
13、fer 3n);return(0);函数名:strncmpi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 0)printf(buffer 2 is less than buffer 1n);if (ptr = 0)printf(buffer 2 equals buffer 1n);return 0;13、strncpy函数名:strncpy功能：串拷贝用 法：char *strncpy(char *destin, char *source, int maxlen);程序例：
