//Downloaded From theonlinetutorials.com
//A program to illustrate text file handling
#include<fstream.h>
#include<conio.h>
#include<stdio.h>
#include<ctype.h>
void main()
 {
 clrscr();
 char str[80],ch;
 int opt,len[10];
do
 {
 cout<<"\nMenu:\n\n1.Write into file\n2.Read from file\n3.Display text\n\n";
 cout<<"Enter option:";
 cin>>opt;
switch(opt)
 {
 case 1:ofstream ofl;      //For writing into a file
 ofl.open("text.txt",ios::out);
 if(!ofl)
 cout<<"\nFile cannot be opened!";
 cout<<"\nEnter a string:";
 gets(str);
 for(int i=0;str[i]!='\0';i++)
 ofl.put(str[i]);
 ofl.put('\n');
 ofl.close();
 break;
case 2:ifstream ifl;          //For reading into a file
 ifl.open("text.txt",ios::in);
 if(!ifl)
 cout<<"File cannot be opened!";
 while(ifl)
 {
 ifl.getline(str,80);
 cout<<str<<endl;
 ifl.close();
 }
break;
case 3:ifstream ifl2("text.txt");    //Outputting text
 if(!ifl2)
 cout<<"\nCannot open file!";
 ofstream ofl2;
 ofl2.open("texttoggle.txt");
 if(!ofl2)
 cout<<"File cannot be oppened!";
 while(ifl2)         //Converting string
 {
 ifl2>>str;
 if(isupper(str[0]))
 str[0]=tolower(str[0]);
 str[0]=toupper(str[0]);
 ofl2<<str;
 cout<<str<<"";
 }
 cout<<endl;
 ofl2.close();
 ifl2.close();
 break;
default:cout<<"\nWrong option!";
 }
 cout<<"Do you want to continue or not(y/n):";
 cin>>ch;
 }
 while(ch=='y'||ch=='Y');
 getch();
}

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Tagged as: C++ Program - Text file handling, CPP Program - Text file handling, Text file handling, Text file handling in C++, Text file handling in CPP