Eroare de compilare: user.cpp:7: error: ‘::main’ must return ‘int’ user.cpp: In function ‘int main()’: user.cpp:8: error: ‘cin’ was not declared in this scope user.cpp:9: error: ‘cout’ was not declared in this scope user.cpp:13: error: invalid conversion from ‘int*’ to ‘int’ user.cpp:13: error: initializing argument 1 of ‘int gcd(int, int)’ user.cpp:13: error: invalid conversion from ‘int*’ to ‘int’ user.cpp:13: error: initializing argument 2 of ‘int gcd(int, int)’