Compilare: main.cpp: In function 'int main()': main.cpp:14:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(c);i++) ~^~~~~~~~~~ main.cpp:16:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if(c[i]>='a'&&c[i]<='z'||c[i]>='A'&&c[i]<='Z') ~~~~~~~~~^~~~~~~~~~~ main.cpp:22:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(c)) ~^~~~~~~~~~