CODEWITHSUNDEEP
c++fileparsingif-statementdelimiter
Hani Al-shafei
Hani Al-shafei

Reputation: 149

Detecting a blank line in C++ from reading a file

I have a plain text file (.txt) with the following data;

data 5

data 7
data 8

I read this file in the following manner:

 ifstream myReadFile;
 myReadFile.open(fileName.c_str());

 if (myReadFile.is_open() != true){
    return -1;
 }

string stri;
int i;

while (std::getline(myReadFile,stri)){
  i++;
  if(stri.find("data") != std::string::npos){ //extract data}

  else if(stri.empty()){ cout << "Conditional statement true"; }

  else { cout << "invalid keyword on line: " << i; }
}

I always receive the invalid keyword message and never does the conditional statement go through. I have tried if (stri == "") and (stri.compare("");

NOTE: It is safe to assume that the empty line contains NO WHITESPACE.

Upvotes: 2

Views: 236

Answers (1)

R Sahu
R Sahu

Reputation: 206577

Here's one way to find the contents of the line that seems to be a problem.

else {
   cout << "invalid keyword on line: " << i;
   size_t size = stri.size();
   for ( size_t i = 0; i < size; ++i )
   {
     // Print the ASCII code of the character.
     cout << "ASCII code: " << (int)stri[i] << std::endl;
   }
}

Find out what the ASCII codes represent from an ASCII code table. That will indicate what's being read into the line. It is most likely a carriage return, \r, with ASCII code 13.

Upvotes: 1

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