C++筆記：習題4.31
Exercise 4.31: Write a program that reads a string into a character array from the standard input. Describe how your program handles varying size inputs. Test your program by giving it a string of data that is longer than the array size you’ve allocated.
/* C++ Primer 習題 4.31
* By Ceeji
*/
#include <iostream>
using namespace std;
const int cachelen = 5;
int main()
{
char value;
char sz [cachelen];
char * sz_p = sz;
int len = 0, maxlen = cachelen;
bool added = false;
while (cin >> value)
{
len++;
if (len <= maxlen - 1)
{
*(sz_p + len - 1) = value;
}
else
{
char * sz_p2 = new char [len + cachelen];
for (int i = 0; i < len - 1; i++)
{
*(sz_p2 + i) = *(sz_p + i);
}
*(sz_p2 + len - 1) = value;
maxlen = len + cachelen;
if (added)
delete [] sz_p;
sz_p = sz_p2;
added = true;
}
}
*(sz_p + len) = NULL;
cout << sz_p;
}
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