Compilare: main.cpp: In function 'int main()': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<text.size(); i++){ ~^~~~~~~~~~~~ main.cpp:19:92: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((text[i]>='a' && text[i]<='z') || (text[i]>='A' && text[i]<='Z') && i<text.size()){ ~^~~~~~~~~~~~ main.cpp:19:88: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while((text[i]>='a' && text[i]<='z') || (text[i]>='A' && text[i]<='Z') && i<text.size()){ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~