Question

For C++: (Use only conditions, loops, user defined functions and arrays) Suppose you had data in a file (input.txt) like this

1 2 6 11 4 8 12 3 16 5 6 14 ………

Find the multiples of 2 in order and store it in the output file (output.txt) like this

2 4 ..........

The number 6 is in the wrong position so the order was disturbed. 6 only comes after 4. Therefore 6 and the other multiples of 2 were also skipped.

Answer 1

// Header Files

#include <iostream>

#include <fstream>

#include<conio.h>

#include<stdio.h>

//Standard namespace declaration

using namespace std;

//Main Function

void main () {

const int SIZE = 100;

std::ifstream fin("input.txt");

std::ofstream outfile("output.txt");

outfile.open();

if (fin.is_open())

{

std::string words[SIZE];

std::string str;

std::cout << "Read from a file!" << std::endl;

for (int i = 0; (fin >> str) && (i < SIZE); ++i) // Will read up to eof() and stop at every whitespace it hits

{

words[i] = str;

}

fin.close();

std::cout << std::endl;

int multiple=2;

for (int i = 1; i <=SIZE; ++i)

{

if( words[i] == multiple*i){

outfile << words[i];

multiple=multiple*i;

}

//std::cout << words[i] << std::endl;

}

}

else cout << "Unable to open file";

getch();

}