Eroare de compilare: user.cpp: In function ‘void ecgrad2(char*, int&, int&)’: user.cpp:11: warning: unused variable ‘r’ user.cpp: In function ‘int ecgrad1(char*)’: user.cpp:129: error: ‘abs’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:143: error: ‘abs’ was not declared in this scope user.cpp:154: error: ‘strstr’ was not declared in this scope user.cpp:161: error: ‘abs’ was not declared in this scope user.cpp:168: error: ‘abs’ was not declared in this scope user.cpp:181: error: ‘abs’ was not declared in this scope