空字符:"\0",空字符往往作为字符串的结束标志。
空格符:" "
1)字符串的长度:空字符的长度为0,空格符的长度为1
1 char a[] = "\0"; 2 char b[] = " "; 3 cout << strlen(a) << endl; //0 4 cout << strlen(b) << endl; //1
2)输出的区别
1 char crr[] = "a b"; //输出是a b 2 char brr[] = "a\0b"; //输出是a --------->因为遇到'\0'代表结束 3 cout << strlen(crr) << endl; 4 cout << strlen(brr) << endl;