Compilare: user.cpp: In function ‘int main()’: user.cpp:15:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(c=='A') ^ user.cpp:22:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(c=='B') ^ user.cpp:29:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(c=='C') ^ user.cpp:36:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(c=='D') ^ user.cpp:43:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(c=='E') ^ user.cpp:50:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(c=='F') ^