ssd5的作业 是关于指针，参数传递的，大神帮忙看下哪里错了，一定说下为啥
#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
using namespace std;
const int INITIAL_LIST_CAPACITY = 10;
void build_wordlist (string* word_list, int capacity, string filename) {
ifstream words;
string word;
int size = 0;
// Allocate the space for the word list
word_list = new string[INITIAL_LIST_CAPACITY];
capacity = INITIAL_LIST_CAPACITY;
// Open the file
words.open (filename.c_str());
if (!words) {
cerr << "Could not open " << filename << endl;
exit(EXIT_FAILURE);
}
// Loop to read in words
words >> word;
while (! words.eof()) {
// If there isn't enough space, grow the array and copy the contents
if (size > (capacity - 1)) {
// Create another array that is twice as large as the word_list
string new_word_list = *(new string[2 * capacity]);
// Copy the words from the word_list into the new array
for (int index = 0; (index < capacity); index++) {
new_word_list = word_list[index];
}
delete word_list;
*word_list = new_word_list;
capacity *= 2;
}
// Save the word
word_list[size] = word;
size++;
// Read in next word
words >> word;
}
words.close();
}
int main (int argc, char *argv[]) {
// An array of string objects to store our
// word list.
string *word_list = 0;
int capacity = 0;
// Read the word list file
build_wordlist (word_list, capacity, "words.txt");
// Print out the words
for (int index = 0; (index < capacity) && (word_list[index] != "");
index++) {
cout << word_list[index] << endl;
}
return EXIT_SUCCESS;
}
[解决办法]
delete word_list;
*word_list = new_word_list;
这里错了 delete掉了 就是野指针了 后面赋值就无法控制了
