U++ framework: C++ language problems and code snippets » Read a text file and assign values to variables int and double

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Re: Read a text file and assign values to variables int and double [message #58101 is a reply to message #46495]

Mon, 14 February 2022 19:35

jjacksonRIAB
Messages: 227
Registered: June 2011

Experienced Member

Very old question and no one answered it but if you want solutions for parsing files a good place to start is with CParser. Yes, it's made to parse C-like languages but it can be adapted for other purposes quite easily.

#include <Core/Core.h>

using namespace Upp;

String test =
R"(
1 ____ 100.00
2 ____ 200.00
3 ____ 300.00
)";

CONSOLE_APP_MAIN {
    CParser parser;
    parser.Set(test);
    
    Vector<int>    integers;
    Vector<double> doubles;
    
    while(!parser.IsEof()) {
        if(parser.IsNumber()) {
            integers.Add() = parser.ReadNumber();
            
            while(parser.IsChar('_')) parser.PassChar('_');
            
            if(parser.IsDouble()) {
                doubles.Add() = parser.ReadDouble();
            }
        }
        else {
            CParser::Pos pos = parser.GetPos();
            Cout() << Format("Error: Unexpected input at (%d, %d)\n", pos.GetColumn(), pos.line);
            return;
        }
    }
    
    Cout() << integers << EOL
           << doubles  << EOL;
}

I'm posting this after so long with no answer because even though you may not have received an answer in a timely manner, someone else will at least find this useful.

Forgot to add that passing on '_' is not strictly necessary unless by "blank space" you mean anything instead of whitespace. CParser will, by default, skip whitespace and if you don't care about verifying the parse, you can easily get away with:

CONSOLE_APP_MAIN {
    CParser parser;
    parser.Set(test);
    
    Vector<int>    integers;
    Vector<double> doubles;
    
    while(!parser.IsEof()) {
        integers.Add() = parser.ReadNumber();
        doubles.Add()  = parser.ReadDouble();
    }
    
    Cout() << integers << EOL
           << doubles  << EOL;
}

but I wanted to show off CParser a bit.

[Updated on: Mon, 14 February 2022 19:51]

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[Message index]

		Read a text file and assign values to variables int and double By: 281264 on Mon, 16 May 2016 10:41
		Re: Read a text file and assign values to variables int and double By: jjacksonRIAB on Mon, 14 February 2022 19:35

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