Compilare: main.cpp: In function 'int phi(int)': main.cpp:18:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(val % i == 0) ^~ main.cpp:20:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' while(val % i == 0) ^~~~~ main.cpp: In function 'int main()': main.cpp:29:9: warning: unused variable 'nr' [-Wunused-variable] int nr = 0; ^~