C program to copy the contents of one file to another file?

C Files I/O − Create, Open, Read, Write and Close a File

C File management

A File can be used to store a large volume of persistent data. Like many other languages 'C' provides the following file management functions,

• Creation of a file
• Opening a file
• Reading a file
• Writing to a file
• Closing a file

Following are the most important file management functions available in 'C,'

Input:
sourcefile = x1.txt
targefile = x2.txt
Output: File copied successfully.

Explanation

In this program we will copy a file to another file, firstly you will specify a file to copy. We will open the file and then read the file that we wish to copy in "read" mode and target file in "write" mode.

Example

#include <iostream>
#include <stdlib.h>
using namespace std;
int main() {
   char ch;// source_file[20], target_file[20];
   FILE *source, *target;
   char source_file[]="x1.txt";
   char target_file[]="x2.txt";
   source = fopen(source_file, "r");
   if (source == NULL) {
      printf("Press any key to exit...
");
      exit(EXIT_FAILURE);
   }
   target = fopen(target_file, "w");
   if (target == NULL) {
      fclose(source);
      printf("Press any key to exit...
");
      exit(EXIT_FAILURE);
   }
   while ((ch = fgetc(source)) != EOF)
      fputc(ch, target);
   printf("File copied successfully.
");
   fclose(source);
   fclose(target);
   return 0;
}