Compilare: user.cpp: In function ‘int main()’: user.cpp:28:4: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation] else ^~~~ user.cpp:30:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’ return 0; ^~~~~~ user.cpp:23:9: warning: ‘N1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(N1%5==0) ~~^~