- UID
- 2198
注册时间2005-6-29
阅读权限255
最后登录1970-1-1
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- 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 <stdio.h>
- #include <string.h>
-
- int main(void)
- {
- char string[10];
- char *str1 = "abcdefghi";
-
- stpcpy(string, str1);
- printf("%s\n", string);
- return 0;
- }
-
- 函数名: strcat
- 功 能: 字符串拼接函数
- 用 法: char *strcat(char *destin, char *source);
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- 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;
- }
-
- 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, char c);
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- int main(void)
- {
- char string[15];
- char *ptr, c = ‘r‘;
-
- strcpy(string, "This is a string");
- ptr = strchr(string, c);
- if (ptr)
- printf("The character %c is at position: %d\n", c, ptr-string);
- else
- printf("The character was not found\n");
- return 0;
- }
-
- 函数名: strcmp
- 功 能: 串比较
- 用 法: int strcmp(char *str1, char *str2);
- 看Asic码,str1>str2,返回值 > 0;两串相等,返回0
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- 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 1\n");
- else
- printf("buffer 2 is less than buffer 1\n");
-
- ptr = strcmp(buf2, buf3);
- 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 <string.h>
- #include <stdio.h>
-
- 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;
- }
-
- 函数名: strcpy
- 功 能: 串拷贝
- 用 法: char *strcpy(char *str1, char *str2);
- 程序例:
-
- #include <stdio.h>
- #include <string.h>
-
- int main(void)
- {
- char string[10];
- char *str1 = "abcdefghi";
-
- strcpy(string, str1);
- printf("%s\n", string);
- return 0;
- }
-
- 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 <stdio.h>
- #include <string.h>
- #include <alloc.h>
-
- 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 <stdio.h>
- #include <string.h>
- #include <alloc.h>
-
- int main(void)
- {
- char *dup_str, *string = "abcde";
-
- dup_str = strdup(string);
- printf("%s\n", 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(char *str1, char *str2);
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- 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;
- }
-
- 函数名: strerror
- 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 <stdio.h>
- #include <errno.h>
-
- int main(void)
- {
- char *buffer;
- buffer = strerror(errno);
- printf("Error: %s\n", buffer);
- return 0;
- }
-
- 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 <string.h>
- #include <stdio.h>
-
- 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;
- }
-
- 函数名: strncmp
- 功 能: 串比较
- 用 法: int strncmp(char *str1, char *str2, int maxlen);
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- 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 <string.h>
- #include <stdio.h>
-
- 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;
- }
-
- 函数名: strncpy
- 功 能: 串拷贝
- 用 法: char *strncpy(char *destin, char *source, int maxlen);
- 程序例:
-
- #include <stdio.h>
- #include <string.h>
-
- int main(void)
- {
- char string[10];
- char *str1 = "abcdefghi";
-
- strncpy(string, str1, 3);
- string[3] = ‘\0‘;
- printf("%s\n", string);
- return 0;
- }
-
- 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:
-
- #include <string.h>
- #include <stdio.h>
-
- 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 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;
- }
-
- 函数名: strnset
- 功 能: 将一个串中的所有字符都设为指定字符
- 用 法: char *strnset(char *str, char ch, unsigned n);
- 程序例:
-
- #include <stdio.h>
- #include <string.h>
-
- 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:
-
- #include <stdio.h>
- #include <string.h>
-
- 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;
- }
-
- 函数名: strrchr
- 功 能: 在串中查找指定字符的最后一个出现
- 用 法: char *strrchr(char *str, char c);
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- int main(void)
- {
- char string[15];
- char *ptr, c = ‘r‘;
-
- strcpy(string, "This is a string");
- ptr = strrchr(string, c);
- if (ptr)
- printf("The character %c is at position: %d\n", c, ptr-string);
- else
- printf("The character was not found\n");
- return 0;
- }
-
- 函数名: strrev
- 功 能: 串倒转
- 用 法: char *strrev(char *str);
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- int main(void)
- {
- char *forward = "string";
-
- printf("Before strrev(): %s\n", forward);
- strrev(forward);
- printf("After strrev(): %s\n", forward);
- return 0;
- }
-
- 函数名: strset
- 功 能: 将一个串中的所有字符都设为指定字符
- 用 法: char *strset(char *str, char c);
- 程序例:
-
- #include <stdio.h>
- #include <string.h>
-
- int main(void)
- {
- char string[10] = "123456789";
- char symbol = ‘c‘;
-
- printf("Before strset(): %s\n", string);
- strset(string, symbol);
- printf("After strset(): %s\n", string);
- return 0;
- }
-
- 函数名: strspn
- 功 能: 在串中查找指定字符集的子集的第一次出现
- 用 法: int strspn(char *str1, char *str2);
- 程序例:
-
- #include <stdio.h>
- #include <string.h>
- #include <alloc.h>
-
- int main(void)
- {
- char *string1 = "1234567890";
- char *string2 = "123DC8";
- int length;
-
- length = strspn(string1, string2);
- printf("Character where strings differ is at position %d\n", length);
- return 0;
- }
-
- 函数名: strstr
- 功 能: 在串中查找指定字符串的第一次出现
- 用 法: char *strstr(char *str1, char *str2);
- 程序例:
-
- #include <stdio.h>
- #include <string.h>
-
- int main(void)
- {
- char *str1 = "Borland International", *str2 = "nation", *ptr;
-
- ptr = strstr(str1, str2);
- printf("The substring is: %s\n", ptr);
- return 0;
- }
-
- 函数名: strtod
- 功 能: 将字符串转换为double型值
- 用 法: double strtod(char *str, char **endptr);
- 程序例:
-
- #include <stdio.h>
- #include <stdlib.h>
-
- 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;
- }
-
- 函数名: strtok
- 功 能: 查找由在第二个串中指定的分界符分隔开的单词
- 用 法: char *strtok(char *str1, char *str2);
- 程序例:
-
- #include <string.h>
- #include <stdio.h>
-
- int main(void)
- {
- char input[16] = "abc,d";
- char *p;
-
- /* strtok places a NULL terminator
- in front of the token, if found */
- p = strtok(input, ",");
- if (p) printf("%s\n", p);
-
- /* A second call to strtok using a NULL
- as the first parameter returns a pointer
- to the character following the token */
- p = strtok(NULL, ",");
- if (p) printf("%s\n", p);
- return 0;
- }
-
- 函数名: strtol
- 功 能: 将串转换为长整数
- 用 法: long strtol(char *str, char **endptr, int base);
- 程序例:
-
- #include <stdlib.h>
- #include <stdio.h>
-
- 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;
- }
-
- 函数名: strupr
- 功 能: 将串中的小写字母转换为大写字母
- 用 法: char *strupr(char *str);
- 程序例:
-
- #include <stdio.h>
- #include <string.h>
-
- int main(void)
- {
- char *string = "abcdefghijklmnopqrstuvwxyz", *ptr;
-
- /* converts string to upper case characters */
- ptr = strupr(string);
- printf("%s\n", ptr);
- return 0;
- }
-
- 函数名: swab
- 功 能: 交换字节
- 用 法: void swab (char *from, char *to, int nbytes);
- 程序例:
-
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
-
- char source[15] = "rFna koBlrna d";
- char target[15];
-
- int main(void)
- {
- swab(source, target, strlen(source));
- printf("This is target: %s\n", target);
- return 0;
- }
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