Eroare de compilare: user.cpp: In function ‘int compare(const void*, const void*)’: user.cpp:16: error: ‘strcmp’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:33: error: ‘strlen’ was not declared in this scope user.cpp:44: error: ‘atoi’ was not declared in this scope user.cpp:46: error: ‘strcpy’ was not declared in this scope user.cpp:54: error: ‘strtok’ was not declared in this scope user.cpp:60: error: ‘strcpy’ was not declared in this scope user.cpp:65: error: ‘atoi’ was not declared in this scope user.cpp:72: error: ‘strcmp’ was not declared in this scope user.cpp:93: error: ‘qsort’ was not declared in this scope