Compilare: user.c: In function ‘main’: user.c:19:20: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(x[i]>='a'&&x[i]<='z'||x[i]>='A'&&x[i]<='Z') ^ user.c:10:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(x,1000000,f); ^