Using Functions to Open , Read, Store and Write to .csv File (C++)

Question

I've been trying to make a c++ program to read and write to a .csv file. However, when i try to return the string inside the read function it somehow loses its value, maybe it is too big? I have tested this by using the cout function and it displays all of the .csv file in question. I am fairly new to c++ so sorry in advance for my code, ( variables i have passed through the functions are as a result of ALOT of testing ) So, mainly the problem is that the variable "lines" seems to be empty when returned. Thanks in advance for all answers

#include <iostream>
#include <string>
#include <fstream>
#include <cstring>
#include <cstdio>
#include <stdio.h>
#include <string.h>
using namespace std;

string read_function(string, string, string, string, int);
void write_function(string, string, string, string, int);

int main()
{
    string line = " ", ans = " ", ans2 = " ", data = " ";
    int i = 0, j = 0;
    cout << "What file do you want to read? : ";
    cin >> ans;
    cout << "What do you want the new file to be called? : ";
    cin >> ans2;
    read_function(line, ans, ans2, data, i);
    write_function(line, ans, ans2, data, i);
    return 0;
}

string read_function(string line, string ans, string ans2, string data, int i)
{
    ifstream read(ans.c_str());
    for (i = 0; !read.eof(); i++)
    {
        getline(read, line, ','); 
        cout << line;
        return line;
    }
}

void write_function(string line, string ans, string ans2, string data, int i)
{
    ofstream write(ans2.c_str(), ios::app);
    write << line << ',';
    write.close();
}

Why do you return inside your for? maybe take return line; outside — JLev, Jul 05 '17 at 11:33
Well, when i use cout to output the string in the for loop it shows everything that is inside the .csv value, but when i try to write it to a new csv file, it writes nothing — ToastehMonkey, Jul 05 '17 at 11:33
@JLev i return the string "line" , EDIT : Doesn't work outside the for loop — ToastehMonkey, Jul 05 '17 at 11:34
Try returning it outside your for loop, and passing it as a reference in the fucntion string read_function(string& line, string ans, string ans2, string data, int i) — JLev, Jul 05 '17 at 11:34
@JLev It still returns a blank csv file , but displays the content in command prompt — ToastehMonkey, Jul 05 '17 at 11:42

Using Functions to Open , Read, Store and Write to .csv File (C++)

0 Answers0