Eroare de compilare: user.cpp: In function ‘void frecventa(char*, int*)’: user.cpp:13: error: ‘strlen’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:35: error: ‘strcat’ was not declared in this scope user.cpp:38: error: ‘strlen’ was not declared in this scope user.cpp:41: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:49: error: ‘strcmp’ was not declared in this scope user.cpp:33: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp:34: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result