Eroare de compilare: user.cpp:1:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(){int a,b;std::fstream::ifstream("adunare.in")>>a>>b;std::fstream::ofstream("adunare.out")<<a+b;} ^ user.cpp: In function ‘int main()’: user.cpp:1:21: error: ‘std::fstream’ has not been declared main(){int a,b;std::fstream::ifstream("adunare.in")>>a>>b;std::fstream::ofstream("adunare.out")<<a+b;} ^ user.cpp:1:64: error: ‘std::fstream’ has not been declared main(){int a,b;std::fstream::ifstream("adunare.in")>>a>>b;std::fstream::ofstream("adunare.out")<<a+b;} ^