Eroare de compilare: user.cpp: In function ‘int compare(const void*, const void*)’: user.cpp:17: error: ‘strcmp’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:34: error: ‘strlen’ was not declared in this scope user.cpp:45: error: ‘atoi’ was not declared in this scope user.cpp:47: error: ‘strcpy’ was not declared in this scope user.cpp:55: error: ‘strtok’ was not declared in this scope user.cpp:61: error: ‘strcpy’ was not declared in this scope user.cpp:66: error: ‘atoi’ was not declared in this scope user.cpp:73: error: ‘strcmp’ was not declared in this scope user.cpp:94: error: ‘qsort’ was not declared in this scope