Slip19
Q.1) Write a C++ program to create a
class Integer. Write necessary member functions to overload the operator unary
pre and post decrement ‘--’ for an
integer number.
#include<stdio.h>
#include<conio.h>
#include<iostream.h>
class integer
{
int no;
public:
integer(){}
integer(int num)
{
no=num;
}
integer operator--()
{
--no;
return *this;
}
integer operator--(int) //post
increment
{
integer temp=*this;
no--;
return temp;
}
void display()
{
cout<<"\nNo =
"<<no;
}
};
void main()
{
integer i(10),i1(10),i3;
clrscr();
cout<<"\nAfter post
increment = ";
i3=i--;
i3.display();
cout<<"\nAfter pre
increment = ";
i3=--i1;
i3.display();
getch();
}
Another way
#include<iostream.h>
#include<conio.h>
class Integer
{
int a;
public:
void
accept();
void show();
void
operator--();
};
void
Integer::accept()
{
cout<<"\nEnter a Number:";
cin>>a;
}
void
Integer::show()
{
cout<<"\nEntered number is:"<<a;
}
void
Integer::operator--()
{
int temp;
temp=a;
cout<<"\nPre decrement of the given number
is:"<<--temp;
cout<<"\nPost decrement of the given number
is:"<<a--;
}
int main()
{
clrscr();
Integer i;
i.accept();
i.show();
i.operator--();
getch();
return 0;
}
Q.2)Write a C++ program to read the contents of a “Sample.txt”
file. Store all the uppercase characters in ”Upper.txt”, lowercase characters
in ”Lower.txt” and digits in “Digit.txt” files. Change the case of each
character from “Sample.txt” and store it in “Convert.txt” file.
#include<conio.h>
#include<fstream.h>
#include<stdlib.h>
#include<ctype.h>
void main()
{
char fname[20];
ifstream fin; ofstream fc,fu,fl,fd;
cout<<"\n Enter file name : ";
cin>>fname;
fin.open(fname,ios::in);
fc.open("convert.txt",ios::out);
fu.open("upper.txt",ios::out);
fl.open("lower.txt",ios::out);
fd.open("digit.txt",ios::out);
if(fin.fail())
{
cout<<"file not exists ";
exit(1);
}
char ch;
while(!fin.eof())
{
ch=fin.get();
if(islower(ch))
{
fl.put(ch);
ch=toupper(ch);
fc.put(ch);
}
else if(isupper(ch))
{
fu.put(ch);
ch=tolower(ch);
fc.put(ch);
}
else if(isdigit(ch))
{
fd.put(ch);
}
else if(isspace(ch))
{fc.put(ch);
}
}
cout<<"file coped....";
getch();
}
