C++

Forum

 
Need help with c++ concept

cplusdummy (6)
ok so we are learning I/O with files. One input file is Data.txt and it contains this:
Robby Tono
5 15
Tim Con
2 13.5
Bella Quint
10 5

and once the output file is created to another .txt file (e.g Ouput.txt) this is displayed.
Robby Tono $75
Tim Con $27
Bella Quint $50

what particular code was done so this "conversion" can happen? Please help
8
Additional Details
Yes, they are multiplied(pretty obvious), but this is done with files. One file is read (DATA.TXT) and contains the information above. And then another file is -Created- output(OUTPUT.TXT) with the names and multiplication like stated above. My question is what code was used to do this?
Last edited on
closed account (zb0S216C)
Such an operation is simple. Here's how I would go about it:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
#include <fstream>
#include <string>
#include <Windows.h>

struct Datum
{
    Datum( );

    std::string FirstName, SecondName;
    int Multiplier, BaseValue;
};

Datum::Datum( )
    : FirstName( "John" ), SecondName( "Doe" ), Multiplier( 0 ), BaseValue( 0 ) 
{ }

bool ExtractDatum( Datum &, std::ifstream & );

int main( )
{
    bool ExtractFailed( false );
    std::ifstream IStream( "MyFile.txt" );

    if( !IStream.is_open( ) )
        return 1;

    Datum Datums[3];

    for( short i( 0 ); i < 3; i++ )
    {
        if( !ExtractDatum( Datums[i], IStream ) )
        {
            MessageBox( nullptr, L"Extraction failed. Check the file format.", L"Extraction Error", 
                        ( MB_OK | MB_ICONERROR ) );
  
            ExtractFailed = true;
            break;
        }
    }

    if( ExtractFailed )
    {
        // Handle failure...
        return 1;
    }
    
    // Manipulate the Datums...

    return 0;
}

bool ExtractDatum( Datum &Data, std::ifstream &Stream )
{
    if( !Stream.is_open( ) )
        return false;

    Stream >> Data.FirstName;
    Stream >> Data.SecondName; 
    Stream >> Data.Multiplier;
    Stream >> Data.BaseValue;

    return true;
}


Wazzak
Last edited on
cplusdummy (6)
I still haven't learned structures or datums.

I need to use call functions, ofstream and ifstream.

i got lost with your code lol thanks though
closed account (DSLq5Di1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
std::ifstream input("data.txt");
std::ofstream output("output.txt");

if (input)
{
    std::string name;
    double a, b;

    while (std::getline(input, name) && input >> a >> b)
    {
        output << name << " $" << a * b << std::endl;
        input.ignore();
    }
}
Mathhead200 (1016)
Lol, Framework... "Such an operation is simple." LMFAO!
closed account (zb0S216C)
:) Why was that so funny, Mathhead?

Wazzak
Topic archived. No new replies allowed.