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  • How to give input to a c++ program from an input file ?

    jigneshdgreat

    Member

    Updated: Oct 26, 2024
    Views: 1.1K
    I know how to take input in c++ using standard console functions like cout and cin . But how can I use an external input file to give input to it??
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  • Dancer_Engineer

    Member • Jan 20, 2012

    jigneshdgreat
    I know how to take input in c++ using standard console functions like cout and cin . But how can I use an external input file to give input to it??
    To get input from a file, you will have to use ifstream to read data from files as input streams.
    To get output to a file, you will have to use ofstream to write data to files as output streams.

    Include this library: #include <fstream>

    I hope that helps. 😀
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  • PraveenKumar Purushothaman

    Member • Jan 22, 2012

    You can try using file handlers... Eg.:
    #include <stdio.h>
int main ()
{
  FILE * pFile;
  pFile = fopen ("myfile.txt","w");
  if (pFile!=NULL)
  {
    fputs ("fopen example",pFile);
    fclose (pFile);
  }
  return 0;
}
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