string - C++ strlen error in Big C++ -

i've been working through of programs in big c++ , after copied append.cpp, eclipse telling me 'strlen' not declared in scope on line 8. took online, , thought because had include <cstring> library, didn't solve it. what's wrong?

append.cpp:

#include <iostream>      using namespace std;  void append(char s[], int s_maxlength, const char t[]) {     int = strlen(s); // error occurs here     int j = 0;     while(t[j] != '\0' && < s_maxlength)     {          s[i] = t[j];          i++;          j++;      }     //add 0 terminator     s[i] = '\0';  }  int main() {     const int greeting_maxlength = 10;     char greeting[greeting_maxlength + 1] = "hello";     char t[] = ", world!";     append(greeting, greeting_maxlength, t);     cout << greeting << "\n";     return 0;  } 

including <cstring> header should solve (should have solved) issue. suspicion correct: eclipse being dumb, gave false positive.

in cases this, don't believe ide! try compile source text - if compiler accepts it, static analysis tool in ide wrong.