A menu driven program to create a text file and include a function to read the file content in uppercase. 

#include<fstream.h>
#include<stdio.h>
#include<ctype.h>
#include<conio.h>

char file[50],a[50],b;

void write()
{
ofstream file1;
file1.open(file,ios::out);

cout<<"\nEnter data to be entered in the file: ";
gets(a);

file1<<a;

file1.close();
}

void uppercase()
{
ofstream file1;
file1.open(file,ios::out) ;

while(file1.get(a))
cout<<toupper(a);
cout<<endl;


file1.close();
}

void read()
{
ifstream file1;
file1.open(file,ios::in);

cout<<"\nContent of this file: ";

while(file1.get(b))
cout<<b;
cout<<endl;

file1.close();
}

void main()
{
 int ch;

 clrscr();

 cout<<"Enter file name: ";
 cin>>file;
 cout<<endl;

 do
  {
   cout<<"1. Change File name."<<endl;
   cout<<"2. Write on the file."<<endl;
   cout<<"3. Change contents of the file to uppercase."<<endl;
   cout<<"4. Read the file."<<endl;
   cout<<"5. Exit."<<endl;
   cout<<"Enter your choice: ";
   cin>>ch;
   switch(ch)
    {
     case 1: {
                  cout<<"\nEnter File name: ";
                  cin>>file;
                  cout<<endl;
                  break;    
                }
     case 2: {
                 write();
                 break;
                }
     case 3: {
                 uppercase();
                 break;
                }
     case 4: {
                 read();
                 break;
                }
     case 5: {
                 break;
                }
    default: {
                cout<<"\nWrong choice entered.\n"<<endl;
                break;
               }
    }

   cout<<endl;
  }

 while(ch!=5);
}

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