how to read inputs from a file and to write outputs to another file in c++

Question

Hi I not good in c how can i turn my program to read inputs from a file and to write outputs to another file in c++

Do you have a write a program? Why not issue a 'cp' system command from the program? — Danish, Mar 11 '11 at 19:48
This is the kind of question where you really need to either [read a book](http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list) or search first. [c++ file input](http://stackoverflow.com/search?q=c%2B%2B+file+input) and [c++ file write](http://stackoverflow.com/search?q=c%2B%2B+file+write) — Bill the Lizard, Mar 11 '11 at 20:02

score 3 · Answer 1 · answered Mar 11 '11 at 19:50

3

I assume you're looking for C++ code. Have a look at this page, it has nice examples for stream file operations.

answered Mar 11 '11 at 19:50

schnaader

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sorry I need answer in c please – duaa Mar 11 '11 at 20:02

score 1 · Answer 2 · answered Mar 11 '11 at 19:53

#include <fstream>
#include <string>

int main(){

 //Open file for reading
 std::ifstream in("input.dat");

 //Open file for writing
 std::ofstream out("output.dat");

 //Temporary buffer for line read from file
 std::string line;

 while(getline(in,line)){//getline removes the newline char
      out<<line<<'\n';   // Appending back newline char  
 }
 return 0;
}

Reference

how to read inputs from a file and to write outputs to another file in c++

2 Answers2