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  1. #include <iostream>
  2. #include <fstream>
  3. #include <cstdio>
  4.  
  5. using namespace std;
  6.  
  7. /*
  8.    The code below should read test string then open file and find similar
  9.    string in the text file (that contains multiple lines) by reading first
  10.    8 chars to make sure code is on the correct line then read next 4 chars
  11.    which could be different every time.
  12.  
  13.    Code works fine for first 8 chars but last 4 chars it never reads
  14.  */
  15.  
  16. void test_value2()
  17. {
  18.    char charRead;
  19.    unsigned char test2String[65] = "12345f67895f";
  20.    unsigned char comparetest2String[65] = { 0 };
  21.    unsigned int counter1 = 0, countChars = 0, countTestChars = 0, countChars2 = 0;
  22.  
  23.    // Read from stdin instead of from a file.
  24.    std::istream& testResultsFile = std::cin;
  25.  
  26.  
  27.    // std::fstream testResultsFile;
  28.    // testResultsFile.open("socc.in", ios::in);
  29.    do
  30.    {
  31.       counter1++; //count number of chars in test2String
  32.    } while (test2String[counter1] != '\0');
  33.    cout << "number of chars in test2String " << counter1 << endl;
  34.  
  35.    while (!testResultsFile.eof())
  36.    {
  37.       testResultsFile.get(charRead);	// Read char from the file
  38.       countChars++;			// count total character read for future comparison with countTestChars
  39.  
  40.       if (countTestChars == 8)
  41.       {
  42.          countChars2 = countChars;
  43.       }
  44.       if ((charRead == test2String[countTestChars]) && (countTestChars < 9))
  45.       {
  46.          comparetest2String[countTestChars] = charRead;
  47.          countTestChars++;
  48.       }
  49.       if ((countTestChars > 8) && (countTestChars < counter1)) // if at least first 8 chars matched, keep reading string
  50.       {
  51.          cout << "trying to read again" << endl;
  52.          comparetest2String[countTestChars] = charRead;
  53.          countTestChars++;
  54.          if (countTestChars == counter1)
  55.          {
  56.             cout << "done " << endl;
  57.             cout << comparetest2String << endl;
  58.             break;
  59.          }
  60.       }
  61.    }
  62. }
  63.  
  64. int main()
  65. {
  66.    test_value2();
  67. }
  68.  
Success #stdin #stdout 0s 3460KB
comments ()
stdin 
12345f67895f useless stuff
stdout 
number of chars in test2String 12
trying to read again
trying to read again
trying to read again
done 
12345f678895
https://ideone.com/b6ebWu
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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