errors1.txt

本程序给出了SSD5实验课中Recommended Exercise2的参考程序 内附有详细的注释 下载后请仔细参照源代码进行分析 切莫完全搬照

    	*The debugging of the wordlist.cpp*
1.
    The first error was hidden in this piece of word:
	"delete word_list;". 
    word_list was dynamicly distributed with more than one block of memory space. So that when we intend to delete it, we should delete them all with the sentence like that: 
	"delete[] word_list;". 
    Or there would hide an unknown dubious trouble.
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2.
    After I fixed that sentence, I move to the next, and found that the new_word_list was just a string. 
	"string new_word_list = *(new string[2 * capacity])"
    It couldn't hold all of the word_list's value but the only value in the last loop. Data loss happened in that way. So I modified the sentence. The result is that:
	"string* new_word_list = new string[2 * capacity];"
    Now new_word_list had the ability to hold the value of word_list. To make it hold the data indeedly, we need to modify the sentence:
	"new_word_list = word_list[index];"
    to:
	"new_word_list[index] = word_list[index];"
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3.
    Redistribution for the word_list was needed after its value was stored. But the sentence:
	"*word_list = new_word_list;"
    was incorrect. I rewrited it to :
	"word_list = new string[2*capacity]"
    And the loop was also rewrited, shown below:
	"for (index = 0; (index < capacity); index++) {
             word_list[index] = new_word_list[index];
         }"
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4.
    Now the function build_wordlist was without bug. But one essential problem was still remained. That was word_list can not get the new space distributed in the function, if the string information is larger than the capacity. To solve that problem, I choice to change the function's return type.
	"void build_wordlist"
    to :
	"string* build_wordlist"
    And one sentence was added to the rear of the function.
	"return word_list;"
    Also, one modification in the main function:
	"word_list = build_wordlist"
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Till now, the program can run successfully.