Working with strings and arrays.

gagless12 · #1 07-May-2008, 19:53

Hi everyone. Back again, unfortunately

.

I've got to put together a calculator sort of program. The calculator works by reading a text file provided by the user that is filled with commands. The program then outputs those files into a new text file named by the user.

Here is a sample of how it works

if commands.txt reads : \
Add 2100000

Add 500

Add 1001

out.txt or whatever the user names the output file will read:

Adding 2100000
Result: 2100000

Adding 500
Result: 2100500

Adding 1001
Result: 2101501

I was told to use an array to go through the digits one by one after converting them from strings to int. I'm working on the addition right now and I'm sort of stuck.

Here is what I've come up with so far.

CPP / C++ / C Code:

#include <string>
#include <iostream>
#include <fstream>
using namespace std;
 
void DoAddition( string charNumber[], int Number[] );
void ReadCommand( void );
string GetString( string Prompt );
void HoldScreen( void );
 
const int SIZE = 5000;
 
int main()
{    
 
    string charNumber[SIZE];
    ofstream ResultFile;
    ReadCommand();
 
    do
    {
        ResultFile.open( GetString( "Enter the file for output--> " ).c_str() );
        if ( ResultFile ) break;
        cout << "Unable to open specified file. " << endl << endl;
        ResultFile.clear();
    }while (true);
 
 
 
 
 
}
void ReadCommand(void)
{
    ifstream CommandFile;
    do
    {
        CommandFile.open( GetString( "Enter the file containing commands--> " ).c_str() );
        if ( CommandFile ) break;
        cout << "Unable to open specified file. " << endl << endl;
        CommandFile.clear();
    }while (true);
 
    string Command;
    string Number;
    CommandFile >> Command >> Number;
    if ( Command == "add" )
        DoAddition();
}
 
void Addition( string charNumber[], int Number[] )
{
 
    for ( int i = 0 ; i <= SIZE ; ++i )
         charNumber[i] - '0' = Number[i] 
 
 
 
}
 
string GetString( string Prompt )
{
    do
    {
        string Response;
        cout << Prompt;
        cin >> Response;
        cin.ignore( 99, '\n' );
        if ( cin )
            return Response;
        cout << "Bad input, please try again." << endl;
        cin.clear();
        cin.ignore( 99, '\n' );
 
    } while ( true );
}

zatora · #2 07-May-2008, 23:13

i am not sure if this is what u need if it is not good enough u may wanna post the problem with more details, i am new my self to c++

CPP / C++ / C Code:

#include <string>
#include <iostream>
#include <fstream>
using namespace std;
void addition(ifstream& infile,ofstream& outfile,int& num);
int main()
{
ifstream indata;
ofstream outdata;
int number =0;
indata.open("data.txt");
outdata.open("output.txt");
addition(indata,outdata,number);
indata.close();
outdata.close();
return 0;
}
void addition(ifstream& infile, int& num)
{
int sum =0;
while(!infile.eof())
{
infile>>str1>>num;
sum =sum+num;
outfile<<str1+"ing"<<num<<endl;
outfile<<"Result :"<<sum<<endl;
}
}

WaltP · #3 09-May-2008, 14:04

Quote:

Originally Posted by gagless12

Hi everyone. Back again, unfortunately

.

I've got to put together a calculator sort of program. The calculator works by reading a text file provided by the user that is filled with commands. The program then outputs those files into a new text file named by the user.

Here is a sample of how it works

if commands.txt reads : \
Add 2100000

Add 500

Add 1001

out.txt or whatever the user names the output file will read:

Adding 2100000
Result: 2100000

Adding 500
Result: 2100500

Adding 1001
Result: 2101501

I was told to use an array to go through the digits one by one after converting them from strings to int. I'm working on the addition right now and I'm sort of stuck.

Here is what I've come up with so far.

CPP / C++ / C Code:

snipped for space

Why is it new posters rely on our psychic powers to figure out what stuck means? Can't you tell us what you are stuck on? What doesn't work? Maybe what your problem is? I take it the Guidelines weren't explicit enough.

One thing I notice is you call the DoAddition() function with no parameters. How does the function know what to add? And where is it? It's not even defined.

To program this easier, from main()
1) Call a function to simply read the file and return with the line read as a string
2) Call a convert function to return the number portion as an integer value
3) Call a calculate function to perform the calculation, return the total
4) Call an output function

gagless12 · #4 14-May-2008, 12:13

I have an insert function using an array with size 5. I want to throw as many numbers as I want into it only keeping the most recent five.

How would I move everything back in the array one spot so I could drop off the first element and put the new element in the fifth spot?

I was thinking something like

CPP / C++ / C Code:

if ( Size >= MAX_SIZE )
		Data[0] = Data[1]
		Data[1] = Data[2]
		Data[2] = Data[3]
		Data[3] = Data[4]
		Data[4] = NewData;

I don't even know if that works, but if it does, is there a cleaner way to do it?

fakepoo · #5 14-May-2008, 12:21

Quote:

Originally Posted by gagless12

I don't even know if that works, but if it does, is there a cleaner way to do it?

Yes, that would work. If you want it cleaner, try putting it in a for-loop.

CPP / C++ / C Code:

for(int i=0;i<MAX_SIZE-1;++i) Data[i] = Data[i+1];
Data[MAX_SIZE-1] = NewData;

zatora · #6 14-May-2008, 14:37

it is going to be a for loop as i see fakepoo did but if u assignement post un example like if u wanna insert five new entry at the time so i can figure out what we need to do exactly do u wanna integrate this in a unction or the main() will take of it

gagless12 · #7 14-May-2008, 18:29

Okay, now if I was to continuously add numbers to the array and at any given time I wanted to know which element was the newest element in the array, I would just search the array right?

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