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Question about run length encoding, encoding part.

arraan (2)
Hello! cplusplus forum
I have a problem with the encoding part of RLE, I just started programming.

The problem is in the ´void coderen ()´ part. The thing i need to do is
encode things like:

abccccccddd to abc6d3
and if there are numbers: 123444455 -> 1\2\3\43\52
and every \ has to be coded with two backslashes \\
so \ \ \ \ -> \ \4 and \ \ \ \ \ -> \ \5
Some of the errors terminal gives in line 171, while my program only has 165!

I understand neither of the following errors:

ERRORS:
error: expected primary-expression before ‘=’ token
else ((kar !== '\\') || (kar !>= '0' && kar !<= '9'))
^
86:42: error: expected ‘)’ before ‘!’ token
else ((kar !== '\\') || (kar !>= '0' && kar !<= '9'))
^
171:1: error: expected ‘)’ at end of input
}
^
171:1: error: expected ‘;’ at end of input
171:1: error: expected ‘}’ at end of input

If anyone could help me out, that´d be great!

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  void coderen (ifstream & invoer, ofstream & uitvoer)
{
	
    int teller;
    teller = 1;
    char kar, prevkar;
    kar = invoer.get();
    prevkar = kar;
    while (! invoer.eof())
    {
	if ((kar == '\\') || (kar >= '0' && kar <= '9'))
        {

        
            while (kar == '\\')
            {
                if (prevkar == kar)
                {
                    teller++;
                    kar = kar + '\\';
                    uitvoer.put(kar);
                }
                else (prevkar != kar);
                {
                    kar = kar + '\\';
		    uitvoer.put(kar);
                }
            }
            
	    while (kar >= '0' && kar <= '9')
            {
                if (prevkar == kar)   
                {
                    teller++;
                    kar = '\\' + kar + '\\';
                    uitvoer.put(kar);
                }
                else (prevkar != kar);
                {
                    kar = kar;
                    uitvoer.put(kar);
                }
            }//while kar

        }//if

            

            
        else ((kar < '0' || kar > '9') && kar != '\n' && kar != '\\')
            {
                while (prevkar == kar)    
                {
                    teller++;
                    uitvoer.put(kar);
                }
            }

            
    }//while eof

}//void

void decoderen (ifstream & invoer, ofstream & uitvoer)
{
	int getal;
	char kar, prevkar;//Variabelen om de in te lezen karakters 
	                  //in op te slaan
	kar = invoer.get();

	while (! invoer.eof())
	{
		getal = 0;
		prevkar = kar;
		uitvoer.put(kar);//Kar in doelfile zetten
		kar = invoer.get();

		while ((kar == '\\') || (kar >= '0' && kar <= '9')) 
		{                                //while no letter

			while (kar == '\\')
			{                           //While backslash
				kar = invoer.get();
				prevkar = kar;
				uitvoer.put(kar);//Teken direct na '\\' 
				                  //moet geput worden

				kar = invoer.get();//Controle of teken daarna '\\' is
			}//while backslash

			if (kar >= '0' && kar <= '9') 
			{                         //Als letter n 
			                          //x herhaald wordt
				getal = kar - '0';
				kar = invoer.get();

				while (kar >= '0' && kar <= '9')
				{                          //Herhaling bepaling
					getal = (getal * 10) + kar - '0';
					kar = invoer.get();
				}
				for (int i (1); i < getal; i++)
				{                            //Uitvoerprocedure
					uitvoer.put(prevkar);
				}
			} //if getal
		}//while no letter
	}//while not endoffile
	invoer.close();
	uitvoer.close();
}//decoderen

//void compressie (int orgAantal, int uitvAantal)
//{
//	int rate =	(uitvAantal/orgAantal)*100;

//	cout<<"cp is "<<rate<<"%"<<endl;
//}  
    

int main ()
{

	ifstream invoer;
	ofstream uitvoer;

	intro();
	begin(invoer,uitvoer);
	coderen (invoer,uitvoer);
	
//	compressie(orgAantal, uitvAantal);
}
Last edited on
Peter87 (11178)
The else part of an if statement should not have a condition.
arraan (2)
ah i see, thanks for the quick reply, Peter! (:
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