The function is called strlen for string length.
对于字符串长度，该函数称为strlen。
String length
原声例句
CS50
CS50
Let's take Jonathan's advice and do int n equals the string length of s.
我们听乔纳森的建议，把int n等于s的字符串长度。
Crash Course Physics 速成课物理
For the fundamental with two fixed ends, we already know that the wavelength is twice the string's length.
对于主要的两个固定侧，我有 我们知道波长是斜边长度的两倍。
端午话传统
Then measure about 27 inches of string length from top to bottom and wrap 6 times, which will give you 12 strings to hang your Zongzi from, because remember we're making a dozen.
量出大约27英寸的绳子长度，从上到下缠绕6次，这样你就会得到12根绳子，用来拴紧你的粽子，因为我们要做一打。
英语百科
String (computer science)
In computer programming, a string is traditionally a sequence of characters, either as a literal constant or as some kind of variable. The latter may allow its elements to be mutated and the length changed, or it may be fixed (after creation). A string is generally understood as a data type and is often implemented as an array of bytes (or words) that stores a sequence of elements, typically characters, using some character encoding. A string may also denote more general arrays or other sequence (or list) data types and structures.