Write a program to generate personalized junk mail. The program takes input both

Question

Write a program to generate personalized junk mail. The program takes input both from an input file and from the keyboard. The input file contains the text of a letter except the name of the recipient is indicated by the three characters #N#. The program asks the user for a name and then writes the letter to a second file but with the three letters #N# replaced by the name. The three-letter string #N# will occur exactly once in the letter.(Will occur many times in our program) Hint: Have your program read from the input file until it encounters the three characters #N#, and have it copy what it reads to the output file as it goes. When it encounters the three letters #N#, it then sends output to the screen asking for the name from the keyboard. You should be able to figure out the rest of the details. Your program should define a function that is called with the input and output streams as arguments. Additional requirements: We are going to allow the three letters #N# occur many times in the letter. All occurrences should be replaced with the recipient

Explanation / Answer

#include <iostream>

#include <fstream>

using namespace std;

void replace(ifstream&,ofstream&);

int main()

{char filename[30];

bool found=false;

cout<<"what is the name of the input file youare using? ";

cin>>filename;

ifstream input;

ofstream output;

input.open(filename);   

if(input.fail())

{ cout<<"file did notopen please check it ";

system("pause");

return 1;

}

cout<<"what is the name of theoutput file you are using? ";

cin>>filename;

cin.ignore(100,' ');

output.open(filename);

replace(input,output);

  

input.close();

output.close();

system("pause");

return 0;

}

void replace(ifstream& in,ofstream& out)   

{bool found=false;

string lookfor="#N#";

string data,name;

int n;

getline(in,data);

while(in)

{if(!found)

{n=data.find(lookfor,0);

if(n!=-1)

{found=true;

cout<<"Enter name: ";

getline(cin,name);

data.replace(n,3,name);

}   

}

out<<data<<endlu;

getline(in,data);

}

}

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