how can i writ in file like test.txt??!

I have 2d array (float) having some values , i want my program create a file if it not exist , and i want to write the values of 2d array (float) in this file , please can any one help me , I am beginner in programming .

check this link out:
Input/Output with files

Code:

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

int main () {
  ofstream myfile;
  myfile.open ("example.txt");
  myfile << "Writing this to a file.\n";
  myfile.close();
  return 0;
}

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This code creates a file called example.txt and inserts a sentence into it in the same way we are used to do with cout, but using the file stream myfile instead

Quote:

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Originally Posted by ahmed eltaher

I have 2d array (float) having some values , i want my program create a file if it not exist , and i want to write the values of 2d array (float) in this file , please can any one help me , I am beginner in programming .

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1- you need 2 loops to check the 2 dimention array cells
2- if the value is not 0 then write it in the file using the instruction in the previous post.


good luck

You're doing matrix multiplication with MPI, and yet you can't figure out how to write to a text file? Dude, your priorities are out of whack here.