Compilare: main.cpp: In function 'int main()': main.cpp:11:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int i = 2; i <= n; i++) ^~~ main.cpp:13:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' if (ok == 1) s++; ^~ main.cpp:13:20: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ok == 1) s++; ^