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//Objective:print any line with an @
//Compiler: TDM MinGW
//Editor: MS NotePad
//libraries
#include <fstream> //file IO
#include <iostream>
using namespace std;
//Programmer defined data types
//NONE
//Special compiler dependent definitions
//NONE
//global constants/variables
//NONE
//Programmer defined functions
void introduction(string obj, string ins); //user introduction
string getFileName(string iOf, string dF); //get name of input and output file
int processLine(int atCnt, string lineFromFile); //checks lines for @
//main program
int main()
{
//Data
string objective = "print any line with an @."; //program objective
string instructions = "Input file name to print and count any line with @s in it, hit enter to select default file names"; //user instructions
string iFileName; //input file name
string dFileName = "fileContainingEmails.txt"; //default file name
string oFileName; //output file name
string eKey; //enter key
//user introduction
introduction(objective, instructions);
//input & output file names
iFileName = (getFileName("input", dFileName)); //set input file based on user input from getFileName subprogram
if (iFileName == dFileName) //check if default input name was selected
dFileName = "copyPasteMyEmails.txt"; //set default output file
else //if default wasnt chosen
dFileName = iFileName; //set default output file based on user input from getFileName subprogram
oFileName = (getFileName("output", dFileName)); //set output file based on user input from getFileName subprogram
//output both file names
cout <<"Input file:" << iFileName << endl; //output input file name to console
cout <<"Output file:" << oFileName <<endl; //output output file name to console
//enter to continune
cout << endl << "Press ENTER key to continue: " << endl; //output prompt to press enter
getline(cin, eKey); //user input
// open input file
ifstream fin; //reserve "fin" for use
fin.open(iFileName.c_str()); //open specifed file from user
if (!fin.good()) throw "I/O error"; //if file isnt open output error to console
//read input file
string lineFromFile; //current line being checked
int atCnt; //#@ in the file count
do
{
getline(fin, lineFromFile); //input line from file
atCnt = (processLine(atCnt, lineFromFile)); //check the line for @s with processLine subprogram
}while (fin.good()); //while there are lines in file to be read
//output # of @s
cout << atCnt <<endl; //output @ count returned from processLine subProgram
//enter to continune
cout << endl << "Press ENTER key to continue: " << endl; //output prompt to press enter
getline(cin, eKey); //user input
}//main
// user introduction
void introduction(string obj, string ins)
{
//data
//obj is the program objective
//ins is the user instructions
//output user introduction
cout << "Objective: This program will " << obj << endl;
cout << "Programmer: Prosper\n";
cout << "Editor(s) used: Notepad\n";
cout << "Compiler(s) used: TDM MinGW\n";
cout << "File: " << __FILE__ << endl;
cout << "Complied: " << __DATE__ << " at " << __TIME__ << endl;
cout << ins << endl << endl;
}//introduction
//getFileName
string getFileName(string iOf, string dF)
{
//data
//iOf is input or output label
//df is default file name
int iV = 0; //checking in filename is valid, 1 is not valid, 0 is not valid
string iFileName; //user input
//output
do
{
cout <<"Enter an " << iOf << " filename [default:" << dF << "]:" <<endl; //output variable prompt
getline(cin, iFileName); //user input
cout << endl; //blank line
//input validation
if (iFileName.length() == 0) //if user pressed enter selecting default
{
iV++; //validate by changing iV to one
}
else if (iFileName.length() >= 5 && iFileName.substr(iFileName.length()-4,4)==".txt") //if input is at least 5 digits long and ends in .txt
{
dF = iFileName; //set default file name to user input
iV++; //validate by changing iV to one
}
else // if input is not valid
{
cout <<"Invalid" <<endl; //output user file name error and tryagain
}
}while (iV != 1); //while input is not valid
return dF; //return user input
} //getFileName
//processLine
int processLine(int atCnt, string lineFromFile)
{
//data
//atCnt is the # of @s in a line
//lineFromFile is the line from file being checked
int i; //loop index
//do this
for (i = 0; i < lineFromFile.length(); i++) //loop to traverse the line from file
{
if (lineFromFile[i] == '@') //checking if char is a @
cout << lineFromFile << endl; //output line if @ is found
atCnt++; //count the found @
}
return atCnt;
}//processLine
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