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                # 比如 strlen 函數的使用 計算字符串長度,使用`strlen`函數,那么可以在命令行執行`man strlen`得到類似的如下結果 > 我是在mac上操作的 ```shell STRLEN(3) BSD Library Functions Manual STRLEN(3) NAME strlen, strnlen -- find length of string LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <string.h> size_t strlen(const char *s); size_t strnlen(const char *s, size_t maxlen); DESCRIPTION The strlen() function computes the length of the string s. The strnlen() function attempts to compute the length of s, but never scans beyond the first maxlen bytes of s. ``` 需要引用`string.h`的頭文件 # 編碼 ```c #include <stdio.h> #include <string.h> int main(int argc, char const *argv[]) { char *p = "11111"; printf("%lu\n", strlen(p)); return 0; } ```
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