C++ Cin 输入到数组
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C++ Cin input to array
提问by Dylan Galea
I am a beginner in c++ and I want to enter a string as character by character into an array , so that I can implement a reverse function .. However unlike C when the enter is hit a '\n' is not insterted in the stream.. how can I stop data from being entered ?
我是 C++ 的初学者，我想将一个字符串作为一个字符一个字符地输入到一个数组中，这样我就可以实现一个反向函数..但是与 C 不同，当输入时，'\n' 没有插入到流中.. 我怎样才能停止输入数据？
my code is :
我的代码是：
#include<iostream>
#include<array>
#define SIZE 100
using namespace std;
char *reverse(char *s)
{
array<char, SIZE>b;
int c=0;
for(int i =(SIZE-1);i>=0;i--){
b[i] = s[c];
c++;
}
return s;
}
int main()
{
cout<<"Please insert a string"<<endl;
char a[SIZE];
int i=0;
do{
cin>>a[i];
i++;
}while(a[i-1]!= 'std::string str;
while (true)
{
char ch;
std::cin >> ch;
if (ch == '\n')
{
break; // End loop
}
str += ch; // Append character to string
}
');
reverse(a);
return 0;
}
回答by Some programmer dude
When you read character by character, it really reads characters, and newline is considered a white-space character.
当您逐个字符读取时，它真正读取的是characters，而换行符被视为空白字符。
Also the array will never be terminated as a C-style string, that's not how reading characters work. That means your loop condition is wrong.
此外，数组永远不会作为 C 样式字符串终止，这不是读取字符的工作方式。这意味着您的循环条件是错误的。
To begin with I suggest you start using std::stringfor your strings. You can still read character by character. To continue you need to actually check what characters you read, and end reading once you read a newline.
首先我建议你开始使用std::string你的字符串。您仍然可以逐个字符地阅读。要继续，您需要实际检查您阅读的字符，并在阅读换行符后结束阅读。
Lastly, your reversefunction does not work. First of all the loop itself is wrong, secondly you return the pointer to the original string, not the "reversed" array.
最后，您的reverse功能不起作用。首先循环本身是错误的，其次返回指向原始字符串的指针，而不是“反向”数组。
To help you with the reading it could be done something like
为了帮助您阅读，可以这样做
#include <string>
#include <algorithm>
#include <iostream>
int main(){
std::string str;
std::cout << "Enter a string: ";
std::getline(std::cin, str);
std::reverse(str.begin(), str.end());
std::cout << str << std::endl;
return 0;
}
Do note that not much of this is really needed as shown in the answer by Stack Danny. Even my code above could be simplified while still reading one character at a time.
请注意，如Stack Danny 的回答所示，真正需要的并不多。即使我上面的代码也可以简化，同时仍然一次读取一个字符。
回答by Stack Danny
Since you tagged your question as C++(and not C) why not actually solve it with the modern C++ headers (that do exactly what you want, are tested, save and work really fast (rather than own functions))?
既然您将您的问题标记为C++（而不是C），为什么不实际使用现代 C++ 标头来解决它（这些标头完全符合您的要求，经过测试、保存和工作速度非常快（而不是自己的函数））？
Enter a string: Hello Test 4321
1234 tseT olleH
output:
输出：
##代码##