Compilare: user.cpp: In function ‘int main()’: user.cpp:16:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(!(x[i]>='a'&&x[i]<='z'||x[i]>='A'&&x[i]<='Z')) ^ user.cpp:19:20: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(x[i]>='a'&&x[i]<='z'||x[i]>='A'&&x[i]<='Z') ^ user.cpp:10:18: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(x,1000,f); ^