Write a C Program to convert file contents to uppercase using file handling

Below is the source code for C Program to convert file contents to uppercase using file handling which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C Program to convert file contents to uppercase using file handling  */

#include<stdio.h>
int main()
{
 int c;
 FILE *fr,*fw;

 if((fr=fopen("C:\\Users\\acer\\Documents\\file4.txt","r"))==NULL)
 {
  printf("File can't be open.");
  return 1;
 }
 if((fw=fopen("C:\\Users\\acer\\Documents\\file5.txt","r+"))==NULL)
 {
  printf("File can't be open.");
  fclose(fr);
  return 1;
 }
 while(1)
 {
  c=fgetc(fr);
  if(feof(fr))
    break;
  c=~c;
  fputc(c,fw);
 }
 printf("\nFile4.txt successfully converted to Uppercase.!!!\n");

 fclose(fr);
 fclose(fw);
 return 0;
}

OUTPUT : :

/*  C Program to convert file content to uppercase using file handling  */

File4.txt successfully converted to Uppercase.!!!

Above is the source code for C Program to convert file contents to uppercase using file handling which is successfully compiled and run on Windows System.The Output of the program is shown above .