Question

Hi I was hoping to get some help with my code for this problem. I don't know how to correctly read a txt file and the difference between using string and cstring. My code is at the bottom please help thanks.

1. Create the following “data.txt” file. Each record consists of customer's name and their balance:

Maria Brown 2100.90

Jeffrey Jackson 200.20

Bernard Smith 223.10

Matthew Davenport 1630.20

Kimberly Macias 19100.90

Amber Daniels 2400.40

The records in the file will be like the text above. You will store them in the struct provided below:

struct PERSON {

   char Name[20];

   float Balance; };

i. We don’t know exactly how many records are in the file. You will have to go through the file a first time and count the number of records (N).

ii . Once you have this information, you can create an array that is large enough to hold all of the records in the file PERSON P[N];

iii. Remember that c_strings or character arrays must be null terminated, so you will either need to set every element to ‘/0’ before writing the name, or make sure you put one after you have written the name.

iv. Display all records in array a. Use calling statement: Display(a, N);

Your output should look like the following:

                Name            Balance

        -----------------------------------------------

Maria Brown 2100.90

Jeffrey Jackson 200.20

Bernard Smith 223.10

Matthew Davenport 1630.20

Kimberly Macias 19100.90

Amber Daniels 2400.40

////////////////////////////my code

#include <iostream>
#include <string>
#include <cstring>
#include <fstream>
using namespace std;

struct PERSON{
char NAME[20];
float Balance;
  
string sName;
sName = str1 + " " + str2;
strcpy(name, sName.cstr())
}

int main() {
fstream myFile;
string fileIN = "data.txt";
myFile.open(fileIN.c_str());

cout << fileIN << endl;

return 0;
}

Answer 1

1>) we need to calculate number of records in the file i.e N.

C++ Program which counts the number of lines in a file can be used here. The program creates an input file stream, reads a line on every iteration of a while loop, increments the count variable and the count variable is the required N.

Here is source code of the C++ program which counts the number of lines in a file.

#include<iostream>

#include<fstream>

using namespace std;

//defining the struct PERSON

struct PERSON {

char name[20];

float balance ;

}

int main()

{

    int count = 0;

    string line;

    /* Creating input filestream */ 

    ifstream infile("data.txt");

    while (getline(infile, line))

        count++;

// storing the value of count i.e total records in N

    int N=count;

//creating an array of type PERSON and length N

PERSON P[N];

// my attempt at printing out the contents of the file


  while (!EOF)
 {
    for (int x = 0; x < N; x++)
    { 
       

          string temp;
         infile >> P[x].name; 
         infile >> temp;
         P[x].name + " ";
         P[x].name + temp;// to store both first name and last name 

       inFile >> P[x].balance;
      

      
    }
  }

  //calling the display function to print the array
display(P,N);
  return 0;

}

void display(PERSON *P , int N) {

for(i = 0; i < N; i++ )

    { printf("Name+" "+"Balance);

        printf("%s\t%f\n",

P[i].name, P[i].balance);

    }

};

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