Compilare: main.cpp: In function 'int main()': main.cpp:32:15: warning: statement has no effect [-Wunused-value] for(x1;x1<=x2;x1++) ^ main.cpp:47:15: warning: statement has no effect [-Wunused-value] for(x1;x1<=x2;x1++) ^ main.cpp:65:27: warning: statement has no effect [-Wunused-value] for(x1;x1<=x2;x1++) ^ main.cpp:80:27: warning: statement has no effect [-Wunused-value] for(x1;x1<=x2;x1++) ^