(C++)Using strings to replace characters [fstream] - Overclock.net

godsgift2dagame · 3 Weeks Ago

Hey guys,

I am struggling with a part of file reading where the goal is to "clean up" the code. Basically, I've gotten to the point where it reads each character and gives spaces between them. However, I need to replace the "text" part of the string with space. For instance, here is an example I'll use:

Code:

12 Hello 34 OCN 56 I need your help

I only want:

Code:

12 34 56

I'm guessing some string manipulation will be needed. I've tried to use isdigit(), but to no avail. Here's what I've got currently. As always, please try to explain the code but not show the solution to my code, as I feel guilty for A) not using your code and upset for B) having actually seen it.

All I would like is an explanation of HOW THIS CAN BE DONE...+1 rep to all who help, as usual.

Code:

#include <fstream>
#include <iostream>
#include <cstdlib>
#include <string>
#include <cctype>
using namespace std;

int main()
{
    string str;
    ifstream lane9;
    ofstream mglane9;
    const int MAX = 1000;
    char scores[MAX];
    int count = 0;
    
    lane9.open("lane9.dat");
    if(lane9.fail())
    {
                    cout << "ERROR! ";
                    exit(1);
    }

    mglane9.open("MGlane9.txt");
    if(mglane9.fail())
    {
                      cout << "ERROR OUTPUT";
    }

    while(!lane9.eof())
    {
        lane9 >> str;
 	cout << str << " ";	
        mglane9 << str << " ";	   
	 
	                    if(isdigit(count))
			    {
			  	mglane9 << str << " ";
				count++;
			    }
    }
	    
    lane9.close();
    mglane9.close();
    
    getchar();
    return 0;
}

fball922 · 3 Weeks Ago

Maybe not the best solution, but maybe keep track of the last character you encountered so that you know what should be done next... I.e. If the last character was a digit and you have a space, do something. Move space to previous character...

Hope you see where I am going with that.

Spotswood · 3 Weeks Ago

You'll need to loop over all of the characters in 'str', calling isdigit(str[i]) and if it is a digit, add that character to another string (or just write the digit to the output file). Oh, and you'll need to add a space between numbers.

3 Weeks Ago	#3 (permalink)
Spotswood Case Modder Join Date: Jul 2008 Location: New Hampshire, USA Posts: 236 Rep: 46 Unique Rep: 39 Trader Rating: 0	You'll need to loop over all of the characters in 'str', calling isdigit(str[i]) and if it is a digit, add that character to another string (or just write the digit to the output file). Oh, and you'll need to add a space between numbers. __________________ Rich Custom Wooden Case Builder

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(C++)Using strings to replace characters [fstream]

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