getpass

getpass(const char* prompt);

char name[1024];

memset(name, 0, sizeof(name));

printf("請輸入用戶名:");

scanf("%s", name);

char *passwd=getpass("請輸入密碼:");

if ((strcmp(name, "root") == 0) && (strcmp(passwd, "123456") == 0)) {

printf("登陸成功\n");

}else{

printf("登陸失敗\n");

}