C program to copy one file to another file

2.Write a C program to copy one file to another file and while doing replace all lower case character to their equivalent upper case character.

program:

#include<stdio.h>

#include<stdlib.h>

#include<ctype.h>

int main()

{

 FILE *fp1, *fp2;

 char ch;

 fp1 = fopen("source.txt", "r");

 if (fp1 == NULL)

 {

 puts("File does not exist..");

 exit(1);

 }

 fp2 = fopen("target.txt", "w");

 if (fp2 == NULL)

 {

 puts("File does not exist..");

 fclose(fp1);

 exit(1);

 }

 while((ch=fgetc(fp1))!=EOF)

 {

 ch = toupper(ch);

 fputc(ch,fp2);

 }

 printf("\nFile successfully copied..");

 return 0;

}

output: