slips 19

/* Slip no : 19_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 postdecrement : ";

                i3=i--;

                i3.display();

                cout<<"\nAfter predecrement : ";

                i3=--i1;

                i3.display();

                getch();

}

/* Slip no : 19_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<iostream.h>

#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();