copy data from one file to another file

write a c code to copy data from one file to another file.

#include<stdio.h>

int main(){

  FILE *p,*q;

  char file1[20],file2[20];

  char ch;

  printf("\nEnter the source file name to be copied:");

  gets(file1);

  p=fopen(file1,"r");

  if(p==NULL){

      printf("cannot open %s",file1);

      exit(0);

  }

  printf("\nEnter the destination file name:");

  gets(file2);

  q=fopen(file2,"w");

  if(q==NULL){

      printf("cannot open %s",file2);

      exit(0);

  }

  while((ch=getc(p))!=EOF)

      putc(ch,q);

  printf("\nCOMPLETED");

  fclose(p);

  fclose(q);

 return 0;

}