功 能: 串查找指定字符現
用 : char *strrchr(char *str, char c);
舉例：
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char fullname="./lib/lib1.so";
char *ptr;
ptr = strrchr(fullname,'/');
printf("filename is %s",++ptr);
//運行結：filename is lib1.so
函數名: strchr
功 能: 串查找指定字符第現
用 : char *strchr(char *str, char c);
舉例：
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char fullname="./lib/lib1.so";
char *ptr;
ptr = strrchr(fullname,'.');
printf("after strchr() is %s",++ptr);
//運行結：after strchr() is /lib/lib1.so
函數名: strtok
功 能: 串查找指定字符第現
用 : char *strtok(char *s, char *delim);
說明：
1.strtok函數實質處理strtoks查找包含delim字符並用NULL(’/0′)替換,直找遍整字符串句兩層含義：（1）每調用strtok函數能獲割單位（2）要獲所割單元必須反復調用strtok函數
2.strtok函數調用需用NULL替換s.
3.形參s(要割字符串)應變量應用char s[]=….形式能用char *s=….形式
舉例：
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void main()
{
char buf[]=Golden Global View;
char* token = strtok( buf, );
while( token != NULL )
{
printf( %s , token );
token = strtok( NULL, );
}
return 0;
}
/*其結：
Golden
Global
View
*/
函數名：strncpy
功能：src所指由NULL結束字符串前n字節復制dest所指數組
用：char *strncpy(char *dest, char *src, int n);
說明：
src前n字節含NULL字符則結NULL字符結束
src度於n字節則NULL填充dest直復制完n字節
srcdest所指內存區域重疊且dest必須足夠空間容納src字符串
返指向dest指針
舉例：
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#include
#include
main()
{
char buf[4];
char *s="abcdefg";
strncpy(buf,s,4);
printf("%s/n",buf);
return 0;
}
/*運行結：
abcd
*/
函數名: stpcpy
功 能: 拷貝字符串另
用 : char *stpcpy(char *destin, char *source);
舉例：
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#include
#include
int main(void)
{
char string[10];
char *str1 = "abcdefghi";
stpcpy(string, str1);
printf("%s/n", string);
return 0;
}
/*運行結
abcdefghi
*/
函數名: strcat
功 能: 字符串拼接函數
用 : char *strcat(char *destin, char *source);
舉例：
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#include
#include
int main(void)
{
char destination[25];
char *blank = " ", *c = "C++", *Borland = "Borland";
strcpy(destination, Borland);
strcat(destination, blank);
strcat(destination, c);
printf("%s/n", destination);
return 0;
}
/*運行結：
Borland C++
*/
函數名: strcmp
功 能: 串比較
用 : int strcmp(char *str1, char *str2);
看Asic碼str1>str2返值 > 0；兩串相等返0
舉例：
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#include
#include
int main(void)
{
char *buf1 = "aaa", *buf2 = "bbb"；
int ptr;
ptr = strcmp(buf2, buf1);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1/n");
else if(ptr < 0)
printf("buffer 2 is less than buffer 1/n");
else
printf("buffer 2 is equal with buffer 1/n");
return 0;
}
/*運行結：
buffer 2 is greater than buffer 1
*/
函數名: strncmpi
功 能: 串部與另串比較, 管寫
用 : int strncmpi(char *str1, char *str2, unsigned maxlen);
舉例：
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#include
#include
int main(void)
{
char *buf1 = "BBB", *buf2 = "bbb";
int ptr;
ptr = strcmpi(buf2, buf1);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1/n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1/n");
if (ptr == 0)
printf("buffer 2 equals buffer 1/n");
return 0;
}
函數名: strcspn
功 能: 串查找第給定字符集內容段
用 : int strcspn(char *str1, char *str2);
舉例：
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#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 %d/n", length);
return 0;
}
函數名: strdup
功 能: 串拷貝新建位置處
用 : char *strdup(char *str);
舉例：
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#include
#include
#include
int main(void)
{
char *dup_str, *string = "abcde";
dup_str = strdup(string);
printf("%s/n", dup_str);
free(dup_str);
return 0;
}
函數名: stricmp
功 能: 寫敏式比較兩串
用 : int stricmp(char *str1, char *str2);
舉例：
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#include
#include
int main(void)
{
char *buf1 = "BBB", *buf2 = "bbb";
int ptr;
ptr = stricmp(buf2, buf1);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1/n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1/n");
if (ptr == 0)
printf("buffer 2 equals buffer 1/n");
return 0;
}
函數名: strerror
功 能: 返指向錯誤信息字符串指針
用 : char *strerror(int errnum);
舉例：
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#include
#include
int main(void)
{
char *buffer;
buffer = strerror(errno);
printf("Error: %s/n", buffer);
return 0;
}
函數名: strncmp
功 能: 串比較
用 : int strncmp(char *str1, char *str2, int maxlen);
舉例：
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#include
#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 than buffer 1/n");
else
printf("buffer 2 is less than buffer 1/n");
ptr = strncmp(buf2,buf3,3);
if (ptr > 0)
printf("buffer 2 is greater than buffer 3/n");
else
printf("buffer 2 is less than buffer 3/n");
return(0);
}
函數名: strncmpi
功 能: 串部與另串部比較, 管寫
用 : int strncmpi(char *str1, char *str2, int len);
舉例：
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#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 1/n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1/n");
if (ptr == 0)
printf("buffer 2 equals buffer 1/n");
return 0;
}
函數名: strnset
功 能: 串所字符都設指定字符
用 : char *strnset(char *str, char ch, unsigned n);
舉例：
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#include
#include
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz";
char letter = 'x';
printf("string before strnset: %s/n", string);
strnset(string, letter, 13);
printf("string after strnset: %s/n", string);
return 0;
}
函數名: strpbrk
功 能: 串查找給定字符集字符
用 : char *strpbrk(char *str1, char *str2);
舉例：
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#include
#include
int main(void)
{
char *string1 = "abcdefghijklmnopqrstuvwxyz";
char *string2 = "onm";
char *ptr;
ptr = strpbrk(string1, string2);
if (ptr)
printf("strpbrk found first character: %c/n", *ptr);
else
printf("strpbrk didn't find character in set/n");
return 0;
}
函數名: strrev
功 能: 串倒轉
用 : char *strrev(char *str);
舉例：
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#include
#include
int main(void)
{
char *forward = "string";
printf("Before strrev(): %s/n", forward);
strrev(forward);
printf("After strrev(): %s/n", forward);
return 0;
}
/*運行結：
Before strrev(): string
After strrev(): gnirts
*/
函數名: strstr
功 能: 串查找指定字符串第現
用 : char *strstr(char *str1, char *str2);
舉例：
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#include
#include
int main(void)
{
char *str1 = "Borland International", *str2 = "nation", *ptr;
ptr = strstr(str1, str2);
printf("The substring is: %s/n", ptr);
return 0;
}
函數名: strtod
功 能: 字符串轉換double型值
用 : double strtod(char *str, char **endptr);
舉例：
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#include
#include
int main(void)
{
char input[80], *endptr;
double value;
printf("Enter a floating point number:");
gets(input);
value = strtod(input, &endptr);
printf("The string is %s the number is %lf/n", input, value);
return 0;
}
函數名: strtol
功 能: 串轉換整數
用 : long strtol(char *str, char **endptr, int base);
舉例：
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#include
#include
int main(void)
{
char *string = "87654321", *endptr;
long lnumber;
/* strtol converts string to long integer */
lnumber = strtol(string, &endptr, 10);
printf("string = %s long = %ld/n", string, lnumber);
return 0;
}
函數名: strupr
功 能: 串寫字母轉換寫字母
用 : char *strupr(char *str);
舉例：
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#include
#include
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz", *ptr;
/* converts string to upper case characters */
ptr = strupr(string);
printf("%s/n", ptr);
return 0;
}