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POwhy my program "creating index" doesn't work?
 

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  1. POwhy my program "creating index" doesn't work?
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    <p>I am coding a program which takes a text file as an input, makes the index of the words of it and prints the output(the index) in a file and in the screen. I coded as below and <strong>tried much to spot the problem or at least narrow it down, but I couldn't.</strong> If anyone can help or spots a problem in syntax or the logic of the code, I would be happy to know.</p> <pre><code>void main(int argc, char * argv[]) { //clearscreen clrscr(); //if arguments are less that default of the program if (argc &lt; 2) { cout &lt;&lt; "You should've input 3 arguments." ; return; } //opening the input file and defining a pointer which points to it as argv[1] FILE *fPtr = fopen(argv[1], "r+"); //defining a 2D array to hold maximum to 200 words holding maximum to 20 characters char words[200][20]; //initializing words 2D array with zero ASCII for(int i = 0; i &lt; 200; i++) for(int j = 0; j &lt; 20; j++) words[i][j] = 255; //defining an 2D whi array which is supposed to show how many times words are placed in which lines in a defined layout //it holds maximum to 200 words holding maximum 100 sentences int index[200][100]; //initializing the index 2D array with zero ASCII for(i = 0; i &lt; 200; i++) for(j = 0; j &lt; 100; j++) index[i][j] = 0; //this array of characters max to 2000 is supposed to hold each line which is gotten with fgets char buff[2000]; //initializing the buff array with zero ASCII for(i = 0; i &lt; 2000; i++) buff[i] = 0; //the max of the words used in the source file is 200. but this valuable named as 'last' says how many words are used in this source file //its initalized as no words is held int last = 0; //defining a pointer to char of punctuation mark characters. all ASCII codes expect for a - z, A - Z, 0 - 9 and newline char *punc; //initializing punctuation marks array for(i = 0; i &lt; 256; i++) { if(i == 10) continue; if(i &gt;= '0' &amp;&amp; i &lt;= '9') continue; if(i &gt;= 'a' &amp;&amp; i &lt;= 'z') continue; if(i &gt;= 'A' &amp;&amp; i &lt;= 'Z') continue; char *string = (char *) &amp;i; strncat(punc, string, 1); } //how many lines is read from the source file int lineread = 0; //a word which the processes are done on that char *word; //one line read while( fgets(buff, 1999, fPtr) != NULL) { //how many words is read from the source file in the current line int wordread = 0; word = strtok(buff, punc); //one word read while( word != NULL) { //sorting int k = 0; while(strcmp(word, words[k])&gt; 0) k++; if(strcmp(word, words[k])) { for(int l = last; l &gt;= 0; l--) { strcpy(words[l + 1],words[l]); for(int o = 0; o &lt;= lineread; o++) index[l + 1][o] = index[l][o]; } last++; strcpy(words[k],word); for(l = 0; l &lt;= lineread; l++) index[k][l] = 0; } index[k][lineread]++; wordread++;//go to next word word = strtok(NULL, punc); } lineread++;//go to next line } //closing the input file fclose(fPtr); //opening the output file and defining a pointer which points to it as argv[2] FILE *fPtr2 = fopen(argv[2], "w+"); //showing the index in cmd for(i = 0; i &lt;= last; i++) { printf("%-20s" , words[i]); fprinf(fPtr2, "%-20s" , words[i]); int m = 0; for(j = 0; j &lt;= lineread; j++) { if(m) { printf("%c", ','); fprintf(fPtr2, "%c", ','); } if(index[i][j]) { printf("%i", j + 1); fprintf(fPtr2, "%i" ,j + 1); } if(index[i][j] &gt; 1) { printf("(%i)", index[i][j]); fprintf(fPtr2, "(%i)", index[i][j]); m = 1; } } printf("\n"); fprintf(fPtr2, "\n"); } //closing the output file fclose(fPtr); } </code></pre> <p>now it errors as Abnormal program termination NULL pointer assignment. I have to use turbo c and I use DOS SHELL. there's a file names as "input.txt" in resourse. and in DOS SHELL I write this:</p> <pre><code>programname.exe input.txt output.txt </code></pre> <p>and my desired output if input.txt is this:</p> <pre><code>hello. hello. how are you? hello. desired output: hello 1(2),3 //2 times in line 2, 1 time in line 1 how 2 //1 time in line 2 are 2 //1 time in line 2 you 3 //1 time in line 3 </code></pre>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMelika Barzegaran Hosseini
    1. USMelika Barzegaran Hosseini
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. VO
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      1. POwhy my program "creating index" doesn't work?
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
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      1. POwhy my program "creating index" doesn't work?
      1. This table or related slice is empty.
      1. VTDownMod
    3. VO
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      1. POwhy my program "creating index" doesn't work?
      1. This table or related slice is empty.
      1. VTDownMod
    1. COI see you define `char * punc`, but it is uninitialized headed into the next loop, where it is used... shouldn't it be initialized to point to some memory?
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      1. POwhy my program "creating index" doesn't work?
      1. USMatthew G.
    2. COno that part works correctly. I'd tested this part before.
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      1. POwhy my program "creating index" doesn't work?
      1. USMelika Barzegaran Hosseini
    3. COAlso, you have `words`, `index`, and `buff` all "initialized with zero ASCII", with the first one setting everything to 255, and the others setting everything to 0. I take it you meant to be doing the same thing to all three.
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      1. POwhy my program "creating index" doesn't work?
      1. USDennis Meng
 

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