Answered: I need to covert from C++

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter8: I/o Streams And Data Files

Section8.3: Random File Access

Problem 6E

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Question

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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