http://www.eyny.com/thread-4742854-1-1.html

gistfile1.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFFERSIZE 4096
void process(char* &_pChar, char* _string);
int main(void)
{
	char InputBuffer[BUFFERSIZE];
	char* p = NULL;
	while ( 1 )
	{
		strcpy(InputBuffer, "");
		printf("Input a name: ");
		scanf("%s", InputBuffer);
		// 輸入 -1 即跳出程式
		if ( strcmp(InputBuffer, "-1") == 0 )
		{
			break;
		}
		process(p, InputBuffer);
	}
	// 顯示字串
	printf("%s\n", p);
	// 釋放記憶體
	if ( p != NULL )
	{
		free(p);
	}
	system("PAUSE");
	return 0;
}
void process(char* &_pChar, char* _string)
{
	size_t _length_string = strlen(_string);
	size_t _length_pChar = 0;
	char* _buffer = NULL;
	// 第一次輸入
	if ( _pChar == NULL )
	{
		_pChar = (char*)calloc((_length_string + 1), sizeof(char));
		strcpy(_pChar, _string);
	}
	// 第二次以後的輸入
	else
	{
		_length_pChar = strlen(_pChar);
		_buffer = (char*)calloc((_length_pChar + 1), sizeof(char));
		strcpy(_buffer, _pChar);
		free(_pChar);
		_pChar = (char*)calloc((_length_pChar + _length_string + 1), sizeof(char));
		strcpy(_pChar, _buffer);
		strcat(_pChar, _string);
		free(_buffer);
	}
}