Compilare: user.cpp: In function ‘int main()’: user.cpp:15:20: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ch>='a' && ch<='z' || ch>='A' && ch<='Z') ~~~~~~~~^~~~~~~~~~ user.cpp:39:18: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ch2>='a' && ch2<='z' || ch2>='A' && ch2<='Z') ~~~~~~~~~^~~~~~~~~~~ user.cpp:39:42: warning: ‘ch2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(ch2>='a' && ch2<='z' || ch2>='A' && ch2<='Z') ~~~~~~~~~^~~~~~~~~~~