锁定用户yzx命令是
A. usermod -l yzx
B. usermod -L yzx
C. usermod -U yzx
D. usermod -u yzx
以下能正确进行字符串赋值、赋初值的语句组是( )
A. char s[5]={ 'a ', 'e ', 'i ', 'o', 'u'};
B. char *s; s="good!";
C. char s[5]="good!";
D. char s[5]; s="good!";
有以下程序:#include"stdio.h" char fun(char *c) {if(*c<='Z'&&*c>='A') *c-='A'-'a';return *c; } main() { char s[81],*p=s; gets(s); while (*p) {*p=fun(p); putchar(*p); p++;} putchar('\n'); }若运行时从键盘输入OPEN T H E DOOR(此处代表Enter键),则输出结果是 ( )
A. oPEN tHE dOOR
B. open the door
C. OPEN T H E DOOR
D. Open The Door