'\0'是什么意思? [英] What does '\0' mean?
问题描述
在下面的代码中,我不能理解两个不同位置的\0是什么意思:
string x =hhhdef\\\
;
cout<< x<< endl
x [3] ='\0';
cout<< x<< endl
cout<<hhh\0defef\\\
<< endl;
结果:
hhhdef
hhhef
hhh
$ b
C ++ 任何人都可以给我一些指针? :string std:
s是计数字符串 - 即,它们的长度存储为整数,并且它们可以包含任何字符。当你用一个
$ b \0
替换第三个字符时,没有什么特别的 - 它被打印,就像它是任何其他字符(特别是,你的控制台只是忽略它) p>
在最后一行,打印一个C字符串,其结尾由第一个 \0
找到。在这种情况下, cout
继续打印字符,直到找到 \0
,在您的情况下,是在第三个 h
之后。
I can't understand what the '\0' in the two different place mean in the following code:
string x = "hhhdef\n";
cout << x << endl;
x[3]='\0';
cout << x << endl;
cout<<"hhh\0defef\n"<<endl;
Result:
hhhdef
hhhef
hhh
Can anyone give me some pointers?
C++ std::string
s are "counted" strings - i.e., their length is stored as an integer, and they can contain any character. When you replace the third character with a \0
nothing special happens - it's printed as if it was any other character (in particular, your console simply ignores it).
In the last line, instead, you are printing a C string, whose end is determined by the first \0
that is found. In such a case, cout
goes on printing characters until it finds a \0
, which, in your case, is after the third h
.
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