Compilare: main.cpp:19:59: warning: unknown escape sequence: '\040' if(c[i] >='A' && c[i]<='z' && c[i]!='[' && c[i] != '\ ' && c[i] != ']' && c[i] != '`') ^~~~ main.cpp: In function 'int main()': main.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < strlen(c); i++) ~~~^~~~~~~~~~~