Compilare: user.cpp: In function ‘int main()’: user.cpp:12:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<strlen(x); ++i) ^ user.cpp:14:27: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (x[i]>='A' && x[i]<='Z' || x[i]<='z' && x[i]>='a') ^ user.cpp:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<strlen(x)) ^ user.cpp:23:27: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (x[i]>='A' && x[i]<='Z' || x[i]<='z' && x[i]>='a') ^ user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=i+1; j<strlen(x); ++j) ^ user.cpp:28:37: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (!(x[i]>='A' && x[i]<='Z' || x[i]<='z' && x[i]>='a')) break; ^