字符串操纵分配帮助的库功能beplay体育怎么安装

beplay体育怎么安装分配帮助:>>数据结构简介>>库从字符串操作中函数

字符串操纵的库功能

To use any of these functions in your code, the header files "strings.h" must be included. It is the programmer s responsibility to check that the destination array is large enough to hold either what is copied or appended to it. C performs error checking in this respect. See the array tutorial for more details. The data type size_t is equivalent to unsigned integer.

Strcpy

strcpy复制了一个字符串,包括空。字符终结器从源字符串到目标。此功能将返回到达目标字符串或错误指针的指针。它的原型是:

char *strcpy(char *,const char *src);

#include

#include

Int main ( )

{

Char first [80], second [80];

printf(“输入字符串:”);

获取(第一):

strcpy(第二,第一个);

printf(“第一:%s,第二个:%s \ n,第一,第二);

返回o;

}

strncpy

strncpy与strcpy相似,但允许指定字符的数量。如果源比目的地短,则比目的地填充无效字符,直到指定的长度。此功能返回指向目标字符串的指针,或错误的错误指针。它的原型是:

Char *strncpy (char *dst, const char *src, size_t len);

strncat

此功能将源字符串附加到目标字符串的末尾。此功能将返回到达目标字符串或错误指针的指针。它的原型是:

char *strcat(char *dst,const char *src):

strncat

This function appends at most N characters from the source string to the end of the destination string. This function returns a pointer to the destination string, or a NULL pointer on error, its prototype is:

char *strncat(char *dst,const char *src,size_t n);

Strcat函数用于将一个字符串连接到另一个字符串。

#include

#include

Int main ( )

{char first [80],第二[80];

printf(“输入字符串:”);

获取(第一);

Printf ("Enter another string :");

获得(第二);

Strcat (first, second);

printf(“两个字符串加在一起:%s \ n”,首先):

}

Strcmp

This function compares two strings, if the first string is greater than the second it returns a number greater than zero. If returns a number less than zero. If the string are equal, it returns 0. Its prototype is:

Int strcmp (const char *fist const char *second);

Example. The following example uses the strcmp function to compare two strings.

#include

#include

Int main ( )

{char first [80],第二[80];

printf(“输入字符串:”);

Gets (first) ;

Printf ("Enter another string :");

获得(第二);

If (strcmp (first, second) == 0)

Puts ("The two strings are equal");

Else

Puts ("The two string are not equal ")

返回0:

}

strncmp

This function compares the first N characters of each string. If the first string is greater than the second it returns a number greater than zero. If second string is greater, it returns a number less than zero. If string is equal it returns 0. Its prototype is:

int strncmp(const char * first,const char * second,size_t n);

斯特伦

This function returns the length of a string, not counting the null character at the end, That is, it returns the character count of the string without the terminators. Its prototype is;

大小_ t strlen(const char *str):

例子。Strlen函数用于确定字符串的长度。

#include

#include

Int main ( )

{

字符名称[80]:

Int length:

printf(“输入您的名字:”);

Gets (name):

Length = strlen (name)

Printf ("your name has %d characters\n", length):

返回0;

}

Memset

MEMSET可用于将字符串初始化为所有null或任何字符。它将字符串的第一个N位置设置为传递的值。目的地可以通过指向NAY类型Char Int Float等指针指定的目的地等。避免使用指示指定不同类型的指针。它的原型是:

void *memst(const void *dst,int c,stite_t n);

Trotk Function

strtok函数用于在刺痛中找到接下来的令牌。代币由可能的定系数列表指定。以下示例从文件中读取一行文本,并使用“定界符空间”选项卡和新行确定单词。然后,每个单词都显示在单独的行上。

ecample

#include

#include

Int Mani ( )

{

文件 *in;

Char line [80];

CAR *DILIMITERS =“ \ T \ n”:

Char *token;

if(((in = fopen(“ C:\\编程\\ c \\ text.txt”,“ r” = = null)

{

puts(“无法打开输入文件”);

返回0;

}

/*Read each line one at a time */

While (! feof (in))

{

/ *获得一行 */

fgets(线,80,in);

如果(!feof(in))

{

/*Break the line up into words */

Token = strtok (line, delimiters);

while(token!= null)

{

Puts (token);

/*Get the next word *\

Token = strtok (NULL, delimiters):

}

}

}

fclose(in);

返回0:

}

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