CODEWITHSUNDEEP
c++
Aivaras
Aivaras

Reputation: 1

how to read integers from file and write each integer into different name integer?

This is how the program looks and i need to make all integers with different name. Like x,x1,x2 and so on...

#include <cstdlib>
#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream iFile("input.txt");        // input.txt has integers, one per line

    while (true) {
    int x;
    iFile >> x;
    if( iFile.eof() ) break;
    cerr << x << endl;

}
 system("Pause");
return 0;

}

Upvotes: 0

Views: 1675

Answers (3)

Thomas Matthews
Thomas Matthews

Reputation: 57688

If you are associating numbers with names, a std::map (an associative container), is the data structure to use:

#include <map>
#include <string>
#include <iostream>
using std::map;
using std::string;
using std::cout;

typedef std::map<string, int> Data_Container;

//...
Data_Container my_container;
//...
my_container["Herman"] = 13;
my_container["Munster"] = 13;
cout << "Herman's number is: " << my_container["Herman"] << "\n";

Upvotes: 0

Jerry Coffin
Jerry Coffin

Reputation: 490108

This sort of situation is why arrays were invented. The syntax changes slightly, so you use x[1], x[2], and so on, instead of x1, x2, and so on, but other than that it's pretty much exactly what you seem to want.

Upvotes: 1

Justin Ardini
Justin Ardini

Reputation: 9866

Do the names all need to be distinct, or is it acceptable to put the numbers into a collection? If so, you can do something like this to read in the numbers.

vector<int> numbers;
ifstream fin("infile.txt");
int x;
while( fin >> x ) {
    numbers.push_back(x);
}

Upvotes: 4

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