Compilare: main.cpp: In function 'void afill(int, int)': main.cpp:20:11: warning: statement has no effect [-Wunused-value] for( i<=0;i<4;i++) ~^~~ main.cpp: In function 'int main()': main.cpp:41:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=0;i<N;i++) ^~~ main.cpp:48:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' g<<nr_zona1<<" "<<nr_zona2<<" "<<nr_zona3; ^ main.cpp: In function 'void afill(int, int)': main.cpp:19:5: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized] int i; ^