Files: Example program on fprintf()

/* Copy a text file of integers.
  Written by:
  Date:
*/
#include <stdio.h>
#include <stdlib.h>

int main (void)
{
// Local Declarations
FILE* spIn;
FILE* spOut;
int   numIn;
int   closeResult;

// Statements
printf("Running file copy\n");
spIn = fopen("P07-03.DAT", "r");
if (!spIn)
  {
   printf("Could not open input file\a\n");
   exit  (101);
  } // if open fail

spOut = fopen("P07-04.DAT", "w");
if (!spOut)
  {
   printf("Could not open output file\a\n");
   exit  (102);
  } // if open fail

while ((fscanf(spIn, "%d", &numIn)) == 1)
  fprintf(spOut, "%d\n", numIn);

closeResult = fclose(spOut);
if (closeResult == EOF)
  {
   printf("Could not close output file\a\n");
   exit  (201);
  } // if close fail

printf("File copy complete\n");
return 0;
} // main

/* Results:
Running file copy
File copy complete

P07-04.DAT contains
1
2
3
4
5
6
7
8
9
10
*/
Files: