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  • C语言字符串函数大全

     

    摘自互联网！比较适合ACMer使用，虽然有string了，那有这些用的顺心啊！当然java 、.net可以飘过！

    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:

    复制代码
    #include <stdio.h> 
    #include <string.h>

    int main(void) 
    { 
       char string[10]; 
       char *str1 = "abcdefghi";

       stpcpy(string, str1); 
       printf("%s
", string); 
       return 0; 
    }
    复制代码

    函数名: strcat 
    功  能: 字符串拼接函数 
    用  法: char *strcat(char *destin, char *source); 
    程序例:

    复制代码
    #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
", destination); 
       return 0; 
    }
    复制代码

    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:

    复制代码
    #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
", c, ptr-string); 
        else 
           printf("The character was not found
"); 
        return 0; 
     }
    复制代码

    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:

    复制代码
    #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
"); 
        else 
           printf("buffer 2 is less than buffer 1
");

        ptr = strcmp(buf2, buf3); 
        if (ptr > 0) 
           printf("buffer 2 is greater than buffer 3
"); 
        else 
           printf("buffer 2 is less than buffer 3
");

        return 0; 
     }
    复制代码

    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:

    复制代码
    #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
");

       if (ptr < 0) 
          printf("buffer 2 is less than buffer 1
");

       if (ptr == 0) 
          printf("buffer 2 equals buffer 1
");

       return 0; 
    }
    复制代码

    函数名: strcpy 
    功  能: 串拷贝 
    用  法: char *strcpy(char *str1, char *str2); 
    程序例:

    复制代码
    #include <stdio.h> 
    #include <string.h>

    int main(void) 
     { 
        char string[10]; 
        char *str1 = "abcdefghi";

        strcpy(string, str1); 
        printf("%s
", string); 
        return 0; 
     }
    复制代码

     

    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:

    复制代码
    #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
", length);

        return 0; 
     }
    复制代码

     

    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:

    复制代码
    #include <stdio.h> 
    #include <string.h> 
    #include <alloc.h>

    int main(void) 
     { 
        char *dup_str, *string = "abcde";

        dup_str = strdup(string); 
        printf("%s
", dup_str); 
        free(dup_str);

        return 0; 
     }
    复制代码

     

    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:

    复制代码
    #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
");

       if (ptr < 0) 
          printf("buffer 2 is less than buffer 1
");

       if (ptr == 0) 
          printf("buffer 2 equals buffer 1
");

       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #include <stdio.h> 
    #include <errno.h>

    int main(void) 
    { 
       char *buffer; 
       buffer = strerror(errno); 
       printf("Error: %s
", buffer); 
       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
");

       if (ptr < 0) 
          printf("buffer 2 is less than buffer 1
");

       if (ptr == 0) 
          printf("buffer 2 equals buffer 1
");

       return 0; 
    }
    复制代码

     

    函数名: strncmp 
    功  能: 串比较 
    用  法: int strncmp(char *str1, char *str2, int maxlen); 
    程序例:

    复制代码
    #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
"); 
       else 
          printf("buffer 2 is less than buffer 1
");

       ptr = strncmp(buf2,buf3,3); 
       if (ptr > 0) 
          printf("buffer 2 is greater than buffer 3
"); 
       else 
          printf("buffer 2 is less than buffer 3
");

       return(0); 
    }
    复制代码

     

    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:

    复制代码
    #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
");

       if (ptr < 0) 
          printf("buffer 2 is less than buffer 1
");

       if (ptr == 0) 
          printf("buffer 2 equals buffer 1
");

       return 0; 
    }
    复制代码

     

    函数名: strncpy 
    功  能: 串拷贝 
    用  法: char *strncpy(char *destin, char *source, int maxlen); 
    程序例:

    复制代码
    #include <stdio.h> 
    #include <string.h>

    int main(void) 
    { 
       char string[10]; 
       char *str1 = "abcdefghi";

       strncpy(string, str1, 3); 
       string[3] = ''; 
       printf("%s
", string); 
       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
");

       if (ptr < 0) 
          printf("buffer 2 is less than buffer 1
");

       if (ptr == 0) 
          printf("buffer 2 equals buffer 1
");

       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #include <stdio.h> 
    #include <string.h>

    int main(void) 
    { 
       char *string = "abcdefghijklmnopqrstuvwxyz"; 
       char letter = 'x';

       printf("string before strnset: %s
", string); 
       strnset(string, letter, 13); 
       printf("string after  strnset: %s
", string);

       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
", *ptr); 
       else 
          printf("strpbrk didn't find character in set
");

       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
", c, ptr-string); 
       else 
          printf("The character was not found
"); 
       return 0; 
    }
    复制代码

     

    函数名: strrev 
    功  能: 串倒转 
    用  法: char *strrev(char *str); 
    程序例:

    复制代码
    #include <string.h> 
    #include <stdio.h>

    int main(void) 
    { 
       char *forward = "string";

       printf("Before strrev(): %s
", forward); 
       strrev(forward); 
       printf("After strrev():  %s
", forward); 
       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #include <stdio.h> 
    #include <string.h>

    int main(void) 
    { 
       char string[10] = "123456789"; 
       char symbol = 'c';

       printf("Before strset(): %s
", string); 
       strset(string, symbol); 
       printf("After strset():  %s
", string); 
       return 0; 
    }
    复制代码

      

    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:

    复制代码
    #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
", length); 
       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
", ptr); 
       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
", input, value); 
       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
", 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
", p); 
       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #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
", string, lnumber);

       return 0; 
    }
    复制代码

     

    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:

    复制代码
    #include <stdio.h> 
    #include <string.h>

    int main(void) 
    { 
       char *string = "abcdefghijklmnopqrstuvwxyz", *ptr;

       /* converts string to upper case characters */ 
       ptr = strupr(string); 
       printf("%s
", ptr); 
       return 0; 
    }
    复制代码

     

    函数名: swab 
    功  能: 交换字节 
    用  法: void swab (char *from, char *to, int nbytes); 
    程序例:

    复制代码
    #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
", target); 
       return 0; 
    }
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  • 原文地址：https://www.cnblogs.com/qjack/p/3225044.html
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