strlen

Returns the length of the C string str.

The length of a C string is determined by the terminating null-character: A C string is as long as the number of characters between the beginning of the string and the terminating null character (without including the terminating null character itself).

返回给定空终止字符串的长度，即首元素为 str 所指，且不包含首个空字符的字符数组中的字符数。

计算字符串 str 的长度，直到空结束字符，但不包括空结束字符。

若 str 不是指向空终止字节字符串的指针则行为未定义。

size_t strlen( const char *str );

Parameters

str

C string.

要计算长度的字符串。

Return Value

The length of string.

该函数返回字符串的长度。

Example

//// Created by zhangrongxiang on 2018/2/7 10:41// File strlen//#include 
    
     #include 
     
      //Software is like sex: it"s better when it"s free.//My name is Linus, and I am your God//Linux is obsolete.//Linux is not Unixint main() {    char *str = "My name is Linus, and I am your God";    size_t length = strlen(str);    printf("%s --> length is %d\n", str, (int) length);    char *str2 = "一切皆文件";    length = strlen(str2);    printf("%s  -- length --> %d\n", str2, (int) length); //15 = 3 * 15    printf("%s  -- sizeof --> %d\n", str2, (int) sizeof("一切皆文件")); //16 = 3 * 5 + 1    char str3[] = "万物皆对象";    printf("%s  -- sizeof --> %d\n", str3, (int) sizeof(str3)); //16 = 3 * 5 + 1    return 0;}