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C 字符串 strlen() 函数

❮ 字符串函数


示例

测量字符串的长度

char myStr[20] = "Hello World";
printf("%zu\n", strlen(myStr));
printf("%zu\n", sizeof(myStr));
自己尝试 »

定义和用法

The strlen() 函数返回字符串的长度,即直到第一个空终止字符为止的字符数。 这小于为字符串保留的内存量,可以使用 sizeof 运算符来测量。

The strlen() 函数在 <string.h> 头文件中定义。


语法

strlen(char * str);

参数值

参数 描述
str 必需。要测量长度的字符串。

技术细节

返回值 表示字符串长度的整数。

❮ 字符串函数


相关页面

C 字符串教程

C 字符串函数教程


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