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I need to covert from C++

I need to covert from C++

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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I need to covert from C++

//appends $$$ to a place between minimum element number and maximum element number
//for datafile 1
 
#include <stdio.h>
#include <stdlib.h>
#include<string.h>
 
int main()
{
  //make a pointer for the file
  FILE *fptr;
 
  //make length variable for length of whole datafile, and for where the user wants to truncate
  int length, num;
  
  //make an array for the original string, truncate
  char string[5000];
 
  //make an array for the data wanting to be appended
  char app[3] = {'$', '$', '$'};
 
  //open the file
  fptr = fopen("datafile1.txt","r");
 
  //print the string if the file opened successfully and display error message and end program if it isn't
  if (fgets(string,5000,fptr) != NULL)
  {
    printf("The string in the file is\n\n");
    puts(string);
  }
  else
  {
    printf("The file could not be opened.\n");
    exit(1);
  }
 
  //close the file
  fclose(fptr);
 
  //find the string length
  length = strlen(string);
 
  //display the length of the string
  printf("\n\nThe length of the string is %d characters long.\n", length);
 
  //ask the user where they want to append the data
  printf("Where would you like to append the string?\n\n");
 
  //create a while loop for when there is no place to truncate, once the user inputs a number to num, the loop will exit
  while(num<1 || num>length-2)
  {
    //ask a user to enter where they want to append and scan it into num
    printf("Enter a number between one and %d:\n", length-1);
    scanf("%d", &num);
  }
 
  //open the datafile to read up to the point where the user wanted
  fptr = fopen("datafile1.txt","r");
 
  //show error message if the file couldn't be opened
  if(fptr == NULL)
  {
    printf("Unable to open file.\n");
  }
 
  //create an array for the string before the truncation
  char string2[5000];
 
  //put the string up to where the user wanted into the new string2 array
  fgets(string2,num+1,fptr);
 
  //close the file
  fclose(fptr);
  
  //put the app on the end of string2
  strcat(string2,app);
 
  //make a variable for num+3
  int j=num+3;
  
  //make a loop to put the rest of string into string2
  for(int i=num;i<length+1;i++)
  {
    string2[j]=string[i];
    j++;
  }
 
  //open datafile_.txt again for appending
  fptr = fopen("datafilex.txt", "a");
 
  //check if the file opened
  if(fptr == NULL)
  {
    printf("\nUnable to open datafilex.txt to add on rest of string with.\n");
  }
 
  //put the rest of the string in
  fputs(string2, fptr);
 
  //close the file
  fclose(fptr);
 
  //open datafile again to read it
  fptr = fopen("datafilex.txt", "r");
 
  //check if the file opened
  if(fptr == NULL)
  {
    printf("\nUnable to open datafilex.txt to read.\n");
  }
 
  //print the new string from new datafile
  fgets(string,5000,fptr);
  printf("\nThe new string is\n\n");
  puts(string);
 
  //close the file
  fclose(fptr);
 
  return 0;
}
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