Compilare: main.cpp: In function 'int main()': main.cpp:17:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < strlen(a) ;) ~~^~~~~~~~~~~ main.cpp:23:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < strlen(a) && a[i] == '.') ~~^~~~~~~~~~~ main.cpp:31:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < strlen(a) && ('a' <= a[i] && a[i] <= 'z') || ('A' <= a[i] && a[i] <= 'Z')) ~~^~~~~~~~~~~ main.cpp:31:37: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while(i < strlen(a) && ('a' <= a[i] && a[i] <= 'z') || ('A' <= a[i] && a[i] <= 'Z')) ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~