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1、C 语言字符串操作函数 1.函数名: strcpy 功 能: 拷贝一个字符串到另一个字符串 用 法: char *strcpy(char *destin, char *source); 程序例: i nclude i nclude int main(void) char string10; char *str1 = “abcdefghi“; stpcpy(string, str1); printf(“%sn“, string); return 0; 2.函数名: strcat 功 能: 字符串拼接函数 用 法: char *strcat(char *destin, char *source);
2、 程序例: i nclude i nclude 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.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(char *str, ch
3、ar c); 程序例: i nclude i nclude 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); else printf(“The character was not foundn“); return 0; 4.函数名: strcmp 功 能: 串比较 用 法: int st
4、rcmp(char *str1, char *str2); 看 Asic 码，str1str2，返回值 0；两串相等，返回 0 程序例: i nclude i nclude 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“); else printf(“buffer 2 is less than buffer 1n“); ptr = st
5、rcmp(buf2, buf3); if (ptr 0) printf(“buffer 2 is greater than buffer 3n“); else printf(“buffer 2 is less than buffer 3n“); return 0; 5.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: i nclude i nclude int main(void) char *buf1 = “BBB“, *buf
6、2 = “bbb“; int ptr; ptr = strcmpi(buf2, buf1); if (ptr 0) printf(“buffer 2 is greater than buffer 1n“); if (ptr i nclude int main(void) char string10; char *str1 = “abcdefghi“; strcpy(string, str1); printf(“%sn“, string); return 0; 7.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, c
7、har *str2); 程序例: i nclude i nclude i nclude 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; 8.函数名: strdup 功 能: 将串拷贝到新建的位置处 用 法: char *strdup(char *
8、str); 程序例: i nclude i nclude i nclude int main(void) char *dup_str, *string = “abcde“; dup_str = strdup(string); printf(“%sn“, dup_str); free(dup_str); return 0; 9.函数名: stricmp 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: i nclude i nclude int main(void) char *buf1 = “BBB“, *bu
9、f2 = “bbb“; int ptr; ptr = stricmp(buf2, buf1); if (ptr 0) printf(“buffer 2 is greater than buffer 1n“); if (ptr i nclude int main(void) char *buffer; buffer = strerror(errno); printf(“Error: %sn“, buffer); return 0; 11.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
10、例: i nclude i nclude 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 i nclude int main(void) char *buf1 = “aaabbb“, *buf2 = “bbbccc“, *buf3 = “ccc“; int ptr; ptr = strncmp(buf2,buf1,3); if (ptr 0)
11、printf(“buffer 2 is greater than buffer 1n“); else printf(“buffer 2 is less than buffer 1n“); ptr = strncmp(buf2,buf3,3); if (ptr 0) printf(“buffer 2 is greater than buffer 3n“); else printf(“buffer 2 is less than buffer 3n“); return(0); 13.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 strnc
12、mpi(char *str1, char *str2); 程序例: i nclude i nclude 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 i nclude int main(void) char string10; char *str1 = “abcdefghi“; strncpy(string, str1, 3)
13、; string3 = 0; printf(“%sn“, string); return 0; 15.函数名: strnicmp 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: i nclude i nclude int main(void) char *buf1 = “BBBccc“, *buf2 = “bbbccc“; int ptr; ptr = strnicmp(buf2, buf1, 3); if (ptr 0) printf(“buffer 2 is greater
14、 than buffer 1n“); if (ptr i nclude int main(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; 17.函数名: strpbrk 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: i nclude i nclude int main(void) char *string1 = “abcdefghijklmnopqrstuvwxyz“; char *string2 = “onm“; char *ptr; ptr = strpbrk(string1, string2); if (ptr) printf(“strpbrk found first character: %cn“, *ptr); else printf(“strpbrk didnt find character in setn“); return 0;
