Eroare de compilare: user.cpp: In function ‘void ecgrad2(char*, int&, int&)’: user.cpp:75: error: ‘sqrt’ was not declared in this scope user.cpp:79: error: ‘floor’ was not declared in this scope user.cpp:81: error: ‘floor’ was not declared in this scope user.cpp:10: warning: unused variable ‘r’ user.cpp: In function ‘int ecgrad1(char*)’: user.cpp:128: error: ‘abs’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:142: error: ‘abs’ was not declared in this scope user.cpp:153: error: ‘strstr’ was not declared in this scope user.cpp:160: error: ‘abs’ was not declared in this scope user.cpp:167: error: ‘abs’ was not declared in this scope user.cpp:180: error: ‘abs’ was not declared in this scope