strlen c

1. The result type of the sizeof operator is size_t, and typedef in the header file is of the unsigned int type. This type ensures that it can accommodate the maximum object size. 2. sizeof is an operator and strlen is a function. 3. sizeof can be a type parameter. strlen can only be a char * parameter and must end with "\ 0. Sizeof can also be used as a parameter using a function, for example:

sizeof type (except array name) strlen measuring actual length strncpy return pointer type1#include 2#include 3#include string.h>4 intMain ()5 {6 Char*p="wangddd";7printf"%d\n",sizeof(p));//output 4, pointer type8 9 Charx[8];Tenprintf"%d\n",sizeof(x));//output 8, amount of memory One Aprintf"%s\n", strncpy (x,"wangddddd",sizeof(x)));//returns the X pointer, showing the first 7 digits normally - //the strncpy return value is a pointer to x

size of the space occupied by the type;Object——the actual amount of space occupied by the object;function——The amount of space that the return type of the function occupies. The return type of the function cannot bevoid. **************Second,StrlenStrlen (...)is a function that can be evaluated at run time. The argument must be a character-type pointer (char*). When an array name is passed in as a parameter, the array is actually degenerate into a pointer. Its function is: Returns the length of

strlen functionSyntax: strlen (String)Definition and Usage: the strlen () function returns the length of a string.substr functionSyntax: substr (string,start,length)Definition and Usage: the substr () function returns part of a string.Parameter description String: Required. A string that specifies the part to return. Start: Required. Specifies where

Article from: Http://www.aintnot.com/2016/02/22/phps-source-analytics-strlenDescription of the Strlen function.strlen string $string )In this article, we can know that strlen the function is defined by the Zend engine. The definition of a function can be viewed here.The source code for the function is also given here:zend_function (strlen) { char *s1; int

(1) strlen get string length(2) Mb_strlenHow to use: Int Mb_strlen (String $str [, String $encoding])Returns the length of the given string. The encoding parameter is a character encoding. If omitted, the internal character encoding is used.PHP//How to encode a file when testing if UTF8$str ='Chinese a character 1 characters'; echo strlen ($STR).'';// -Echo Mb_strlen ($STR,'UTF8').'';//6Echo Mb_strlen ($STR

strlen function Description. int strlen (String $string) In this article, we can see that the strlen function is defined by the Zend engine. The definition of a function can be viewed here. Here also gives the function of the source code: Zend_function (strlen) { char *s1; int S1_len; if (Zend_parse_para

Use of sscanf and sprintf Input and Output in C language and explanations of Strlen and MemsetSscanf ()-read data that matches the specified format from a string. Swscanf ()-This function is used to process wide character strings. It is similar to sscanf. By learning and using this function, I personally think that the string format is not very complex, but it is not easy to use this function, this scale depends on your own. The string is not very com

Note: This article is a small series of original, if reproduced, please indicate the source: http://blog.csdn.net/u012116457/article/details/42536039Today formally began to learn PHP, but the small part accidentally found a use of PHP need to pay special attention to the place.As this example:The output of this code is:the length of the name is: 6Let's explore why this problem occurs:PHP's built-in string length function strlen () does not handle Chin

This article introduces the content of PHP strlen () and Mb_strlen () comparison, has a certain reference value, now share to everyone, the need for friends can refer to This article is Bo Master original, such as reproduced please indicate the source. First look at what the official documents say; Strlen ()-Used to get the string length int strlen ( string $

Original address: http://www.51testing.com/html/72/n-221172.htmlLegend is a common written question: Do not use intermediate variables to find the const string length, that is, the implementation of String length library function strlen function. The function interface is declared as follows: int strlen (const char *p);Thinking Analysis:In a string, you can usually take advantage of the last Terminator ' \

integer, which should be 4);type-The amount of space that the type occupies;Object-The actual amount of space occupied by the object;function--the amount of space that the return type of the function occupies. The return type of the function cannot be voidSecond, strlenstrlen (...) is a function that can be evaluated at run time. The argument must be a character pointer (char*), and must be terminated with '/'.When an array name is passed in as a parameter, the array is actually degenerate int

Most of us use strlen to verify the length of a string, but in fact isset can also verify the length of the string.If I want to verify that the $var variable string is longer than 5. If it is strlen, this will write Strlen ($var) >5.Isset can then write Isset ($var [5]). Replace the Var variable with an array, and the 5th position in the view array is not NULL. T

sizeof is an operator, strlen is a function sizeof can use the type parameter, strlen can only use char* to do parameters, and must be ", 0" end. There are differences in the length of the computed string array: charstr[20]="0123456789";int a=strlen(str);int b=sizeof(str);a 计算的是以0x00结束的字符串（不包括0x00结束符），所以a=10;b 计算的则是分配是数组str[20]所占的内存空间的大小，不受里面存储内容的改变而

, which is a long integer, which should be4); type——The size of the space occupied by the type;Object——the actual amount of space occupied by the object;function——The amount of space that the return type of the function occupies. The return type of the function cannot bevoid. **************Second,StrlenStrlen (...)is a function that can be evaluated at run time. The argument must be a character-type pointer (char*). When an array name is passed in as a parameter, the array is actually degenerate

A few days ago, I encountered an interesting problem. Implementing strlen does not consider thread security: The following is my implementation: 1 size_t strlen(const char* s)2 {3 const char* p = s;4 while (*p++);5 return p-1-s;6 } Implementation of glibc 2.19:For this implementation, the function header is not too white, size_t strlen (STR) const cha

# Include # Include Void main (){Char X [] = {'A', 'B', 'C', 'D '};Int Len = strlen (X );Printf ("% d \ n", Len );} If \ 0 is added, Len is equal to the number of characters. If no value is added, Len is not the expected value .. Strlen uses '\ 0' as the Terminator. If there is no Terminator above, it will always talk about the next' \ 0' in the memory. The length is uncertain.Char X [] = {'A', 'B', 'C'

Strlen is the length of a valid string and does not contain '\ 0'. It is related to initialization.The sizeof () function returns the amount of memory occupied after variable declaration, not the actual length. Most CompilationProgramSizeof is computed during compilation. The strlen result can be calculated only during running. It is used to calculate the string length, not the memory size of the type.For

Play PHP (a)-php processing Chinese character string length: strlen and mb_strlen note: This article is a small series of original, if reproduced, please indicate the source: http://blog.csdn.net/u012116457/article/details/42536039 I officially started learning PHP today, but I accidentally discovered something that requires special attention when using PHP. For example: The output result of this code is: name Length: 6 First, let's lo

/// /// Obtain the first LEN character of the string, in the unit of Chinese character width. /// /// /// /// Public static string strlen (string STR, int Len ){ String strnew = ""; Int strlen = 0; For (INT I = 0; I If (INT) STR [I] gt; 255) { Strlen + = 2; Strnew + = STR [I]. tostring (); } Else { Strlen + = 1; Strne