b)Create
a C++ class MyFile with data members file pointer and filename. Write necessary
member functions to accept and disp lay File . Overload the following
operators:
Operator Example Purpose
+ F3=Fl+F2 Concatenate the contents of file F1 and F2
in F3.
! F3 Changes the case of alternate
characters of file F3.
#include<conio.h>
#include<stdio.h>
#include<iostream.h>
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
#define
MAXSIZE (10)
class
myfile
{
FILE *fp;
char fn [MAXSIZE];
public:
myfile(char * fname)
{
strcpy(fn,fname);
}
myfile operator +(myfile);
void operator !();
void display();
};
void myfile::display()
{
fp=fopen(fn,"r");
char ch;
while((ch=fgetc(fp))!=EOF)
{
cout<<ch;
}
fclose(fp);
}
void myfile::operator !()
{
myfile f4("sy.txt");
char ch;
fp=fopen(fn,"r");
f4.fp=fopen(f4.fn,"w");
while((ch=fgetc(fp))!=EOF)
{
if(isupper(ch))
fputc(tolower(ch),f4.fp);
else if (islower(ch))
fputc(toupper(ch),f4.fp);
else
fputc(ch,f4.fp);
}
fclose(fp);
fclose(f4.fp);
remove("abc.txt");
rename("sy.txt","abc.txt");
}
myfile myfile::operator +(myfile f2)
{
myfile f3("abc.txt");
fp=fopen(fn,"r");
f2.fp=fopen(f2.fn,"r");
f3.fp=fopen(f3.fn,"w");
char ch;
while((ch=fgetc(fp))!=EOF)
{
fputc(ch,f3.fp);
}
fclose(fp);
while((ch=fgetc(f2.fp))!=EOF)
{
fputc(ch,f3.fp);
}
fcloseall();
return f3;
}
int main()
{
myfile f1("xyz.txt");
myfile f2("lmn.txt");
myfile f3("abc.txt");
clrscr();
cout<<"first file \n";
f1.display();
cout<<"second file \n";
f2.display();
f3=f1+f2;
cout<<"\n After concatnation file
is";
f3.display();
cout<<"\n after changes case
\n";
!f3;
f3.display();
getch();
return 0;
}
