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what would ios mean with these statements  femaleFile.open("FEMALE.TXT",ios::in); maleFile.open("MALE.TXT",ios::in); mergeFile.open("MERGE.TXT",ios::out); and what does (80 , '\n') in femaleFile.ignore(80,'\n'); // Flush the input stream. maleFile.ignore(80,'\n'); // Flush the input stream Lastly why does the '$' symbol mean as a delimiter Thank you for your help!

what would ios mean with these statements  femaleFile.open("FEMALE.TXT",ios::in); maleFile.open("MALE.TXT",ios::in); mergeFile.open("MERGE.TXT",ios::out); and what does (80 , '\n') in femaleFile.ignore(80,'\n'); // Flush the input stream. maleFile.ignore(80,'\n'); // Flush the input stream Lastly why does the '$' symbol mean as a delimiter Thank you for your help!

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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what would ios mean with these statements 

femaleFile.open("FEMALE.TXT",ios::in);
maleFile.open("MALE.TXT",ios::in);
mergeFile.open("MERGE.TXT",ios::out);

and what does (80 , '\n') in

  • femaleFile.ignore(80,'\n'); // Flush the input stream.
  • maleFile.ignore(80,'\n'); // Flush the input stream

Lastly why does the '$' symbol mean as a delimiter

Thank you for your help!

// The data into one file. #include <fstream> #include <iostream> using namespace std; int main () { // Declare Variables to input data from the files: int femaleId; string female Last Name; string femaleFirstName; string femaleAddress; int maleId; string maleLastName; string maleFirstName; string maleAddress; // Declare Files: ifstream femaleFile; ifstream maleFile; ofstream mergeFile; // Open the files: femaleFile.open("FEMALE.TXT", ios::in); maleFile.open("MALE.TXT",ios::in); mergeFile.open("MERGE.TXT", ios::out); // If file error opening one of the files, print error and stop program. if ((!femaleFile)||(!maleFile)||(!mergeFile)) cout << "Error opening file.\n"; return 0; } // Loop while not end of the Female file or Male file. while ((!female File.eof()) || (!maleFile.eof())) Read a Female Record. femaleFile >> femaleId; femaleFile >> femaleLastName; femaleFile >> femaleFirst Name; femaleFile.ignore(80, '\n'); // Flush the input stream. get line (femaleFile, femaleAddress, '$'); // The '$' is a delimiter. // Read a Male Record. maleFile >> maleId; maleFile >> maleLast Name; maleFile >> maleFirstName; __maleFile.ignore(80, '\n'); // Flush the input stream. get line (maleFile, maleAddress, '$'); // The '$' is a delimiter. // If not End of Female or Male file output both records to the Merge File. if ((!femaleFile.eof())||(!femaleFile.eof())) // Output Female record to the Merge file. mergeFile << femaleId << '\n';
Transcribed Image Text:// The data into one file. #include <fstream> #include <iostream> using namespace std; int main () { // Declare Variables to input data from the files: int femaleId; string female Last Name; string femaleFirstName; string femaleAddress; int maleId; string maleLastName; string maleFirstName; string maleAddress; // Declare Files: ifstream femaleFile; ifstream maleFile; ofstream mergeFile; // Open the files: femaleFile.open("FEMALE.TXT", ios::in); maleFile.open("MALE.TXT",ios::in); mergeFile.open("MERGE.TXT", ios::out); // If file error opening one of the files, print error and stop program. if ((!femaleFile)||(!maleFile)||(!mergeFile)) cout << "Error opening file.\n"; return 0; } // Loop while not end of the Female file or Male file. while ((!female File.eof()) || (!maleFile.eof())) Read a Female Record. femaleFile >> femaleId; femaleFile >> femaleLastName; femaleFile >> femaleFirst Name; femaleFile.ignore(80, '\n'); // Flush the input stream. get line (femaleFile, femaleAddress, '$'); // The '$' is a delimiter. // Read a Male Record. maleFile >> maleId; maleFile >> maleLast Name; maleFile >> maleFirstName; __maleFile.ignore(80, '\n'); // Flush the input stream. get line (maleFile, maleAddress, '$'); // The '$' is a delimiter. // If not End of Female or Male file output both records to the Merge File. if ((!femaleFile.eof())||(!femaleFile.eof())) // Output Female record to the Merge file. mergeFile << femaleId << '\n';
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