1. #include<iostream.h>
#include<fstream.h>
#include<math.h>
void main()
{
clrscr();
ofstream fout("Myfile");
fout<<"Ganesh";
fout.close();
ifstream fin("Myfile");
char ch;
while(fin)
{
fin.get(ch);
cout<<ch;
}
fin.close();
getch();
}
52. Write a program that will create a data file containing the list of telephone numbers
and name. Use a class object to store each set of data.
/*
* To write the complex data types like array, structure or
* classes, we have already discussed that only one method
* for read and one method for write is used :
* These are - fout.write((char *)&obj, sizeof(obj));
* and fin.read((char *)&newObj, sizeof(newObj));
*/
#include<fstream.h>
#include<conio.h>

2. #include<iostream.h>
#include<fstream.h>
class tel
{
private:
char *name, *number;
public:
void setdata()
{
cout<<"Enter Name and number"<<endl;
cin>>name>>number;
}
void display()
{
cout<<"Name : "<<name<<endl;
cout<<"Number : "<<number<<endl;
}
};
void main()
{
tel obj;

3. obj.setdata();
obj.display();
ofstream fout;
fout.open("om.txt",ios::out);
fout.write((char *)&obj, sizeof(obj));
cout<<"successfully written on file: ";
fout.close();
ifstream fin;
tel newObj;
fin.open("om.txt",ios::in);
fin.read((char *)&newObj, sizeof(newObj));
cout<<" Read Succesfull"<<endl;
newObj.display();
getch();
}
#include <iostream.h>
#include <fstream.h>
/*
* Copy one file onto the end of another, adding line numbers
*/
int main () {
char myline[256];
int lc = 0;

4. ofstream outfile("demo.txt",ios::app);
ifstream infile("stdcodes.xyz");
if (! infile) {
cerr << "Failed to open input filen";
exit(1);
}
while (1) {
infile.getline(myline,256);
if (infile.eof()) break;
lc++;
outfile << lc << ": " << myline << "n";
}
infile.close();
outfile.close();
cout << "Output " << lc << " records" << endl;
}
/* Sample Output
munchkin:c235 grahamellis$ ./file01
Output 110 records
munchkin:c235 grahamellis$
*/
C++ program to write number 1 to 100 in a data file NOTES.TXT
#include<fstream.h>
int main()
{
ofstream fout;
fout.open("NOTES.TXT");
for(int i=1;i<=100;i++)
fout<<i<<endl;
fout.close();
return 0;
}

5. C++ program, which initializes a string variable and outputs the string to the disk file
#include<fstream.h>
int main()
{
ofstream fout;
fout.open("out.txt");
char str[300]="Time is a great teacher but unfortunately it kills
all its pupils. Berlioz";
fout<<str;
fout.close();
return 0;
}
User-defined function in C++ to read the content from a text file OUT.TXT, count and
display the number of alphabets present in it
void alphabets()
{
ifstream fin;
fin.open("out.txt");
char ch;
int count=0;
while(!fin.eof())
{
fin.get(ch);
if(isalpha(ch))
count++;
}
cout<<"Number of alphabets in file are "<<count;
fin.close();
}
User defined function in C++ to count the number of blank present in a text file named
"OUT.TXT".
void blankspace()
{
ifstream fin;

6. fin.open("out.txt");
char ch;
int count=0;
while(!fin.eof())
{
fin.get(ch);
if(ch==' ')
count++;
}
cout<<"Number of blank spaces in file are "<<count;
fin.close();
}
User defined function in C++ to print the count of word the as an independent word in a
text file STORY.TXT
void countword()
{
ifstream fin;
fin.open("STORY.TXT");
char word[30];
int count=0;
while(!fin.eof())
{
fin>>word;
if(strcmpi(word,"the")==0)
count++;
}
cout<<"Number of the word in file are "<<count;
fin.close();
}
Function in C++ to count and display the number of lines not starting with alphabet 'A'
present in a text file "STORY.TXT"
void countlines()
{
ifstream fin;
fin.open("STORY.TXT");
char str[80];
int count=0;
while(!fin.eof())
{
fin.getline(str,80);
if(str[0]!='A')

7. count++;
}
cout<<"Number of lines not starting with A are "<<count;
fin.close();
}
User defined function in C++ named copyupper(), that reads the file FIRST.TXT and
creates a new file named SECOND.TXT contains all words from the file FIRST.TXT in
uppercase
void copyupper()
{
ifstream fin;
fin.open("FIRST.TXT");
ofstream fout;
fout.open("SECOND.TXT");
char ch;
while(!fin.eof())
{
fin.get(ch);
ch=toupper(ch);
fout<<ch;
}
fin.close();
fout.close();
}
A C++ function, that reads the file FIRST.TXT and creates a new file named
SECOND.TXT, to contain only those words from the file FIRST.TXT which start with a
lowercase vowel
void vowelwords()
{
ifstream fin;
fin.open("FIRST.TXT");
ofstream fout;
fout.open("SECOND.TXT");
char word[30];
while(!fin.eof())
{
fin>>word;
if(word[0]=='a'||word[0]=='e'||word[0]=='i'||word[0]=='o'||word[0]=='u
')

8. fout<<word<<" ";
}
fin.close();
fout.close();
}
ser defined function in C++ to count number of words in a text file named "OUT.TXT"
void countwords()
{
ifstream fin;
fin.open("out.txt");
char word[30];
int count=0;
while(!fin.eof())
{
fin>>word;
count++;
}
cout<<"Number of words in file are "<<count;
fin.close();
}