Compilare: user.cpp: In function ‘int main()’: user.cpp:24:7: warning: unused variable ‘a’ [-Wunused-variable] int a = atoi(line.c_str()); ^ user.cpp:26:10: warning: unused variable ‘b’ [-Wunused-variable] int b = atoi(line.c_str()); ^ user.cpp:32:13: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<< a+b; ^ user.cpp:32:13: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized]