问题描述
这是我的代码:
#include <iostream>
using namespace std;
int main(){
char inp[5], out[4];
cin >> inp >> out;
cout << inp << endl;
cout << out << endl;
system("pause");
return 0;
}
键入:
12345
6789
123456789
它给了我:
6789
为什么我无法保存5个字的char数组'inp',它没有显示什么?第二个输入看起来正常。然而,当我出[3]或出[5],它似乎工作好吗?看来,两个字符数组[5],然后是[4]会导致问题...
Why I failed to save the 5 words char array 'inp' and it showed nothing? The second input looks normal though. However, when I set out[3] or out[5], it seems to work alright? It seem that two char array of [5] then followed by [4] would cause problem...
推荐答案
您输入(类型) 1234567890
字符以输入 inp [5]
的数据 - 这是一个问题,因为 imp
数组能够存储4个字符和null终止符。当 cin>> inp
存储超过4个字符到 inp
数组导致数据的问题(一些像未定义的行为)。所以解决方案可以为数据分配更多的内存,例如:
I see that you enter (type) 1234567890
characters to input data for inp[5]
- it is a problem because imp
array is able to store 4 characters and null-terminator. When cin >> inp
store more than 4 characters to inp
array it leads to problem with data (somthing like undefined behaviour). So solution can be in allocation more memory for data, e.g.:
#include <iostream>
using namespace std;
int main(){
char inp[15], out[15]; // more memory
cin >> inp >> out;
cout << inp << endl;
cout << out << endl;
system("pause");
return 0;
}
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