Compilare: user.cpp: In function ‘int main()’: user.cpp:24:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(s);i++) ^ user.cpp:32:23: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s[i]>='a' && s[i]<='z' || s[i]>='A' && s[i]<='Z') ^ /tmp/ccGP9WsO.o: In function `_read()': user.cpp:(.text+0x45): warning: the `gets' function is dangerous and should not be used.