set manipulation 0

This is a discussion on set manipulation 0 within the C++ Programming forums, part of the General Programming Boards category; As part of my assignment I have to create an array of ints based on user input. lets say that ...

  1. #1
    Registered User axon's Avatar
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    set manipulation 0

    As part of my assignment I have to create an array of ints based on user input. lets say that the user types in the following command:
    Code:
    > create 3 5 6 1 8
    I have to make an array with those ints in it and of precisely that size. The way my program is set up is that I input the comman word into a string, compare it, and then depending on what it is do further things (look at code below). After that I have to parse the next input taking out the ints seperated by whitespace...I think you know what I mean.

    I really don't want to use strtok(), but it looks like I will have to, any other ideas?

    Code:
    void getCommand()
    {
    	int firstVal = 0;	//these will hold the values following each command 
    	int secondVal = 0;	//except create, setids, and quit
    	Sets object;
    	string command;		//holds the first word of the user inputed command
    	string set;
    	
    	cout << ">  ";
    	cin >> command;
    
    	//create a set
    	if( command == "create" )
    	{
    		cout << endl << command;
    		//problem lies here
    	}
    	//destroy set
    	else if( command == "destroy" )
    	{
    		cin >> firstVal;
    		object.set( firstVal );
    	}		
    ........... and so on for other set manipulating functions
    thanks

    some entropy with that sink? entropysink.com

    there are two cardinal sins from which all others spring: Impatience and Laziness. - franz kafka

  2. #2
    Registered User Codeplug's Avatar
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    You could get the entire line into a string, then construct an istringstream object to use.
    Code:
    #include <iostream>
    #include <sstream>
    #include <strstream>
    using namespace std;
    
    int main()
    {
        istringstream in("1 2 3 4 5 6 7 8 9");
    
        int i;
        while(in.good())
        {
            in >> i;
            cout << i << " ";
        }//while
    
        return 0;
    }//main
    gg

  3. #3
    Registered User axon's Avatar
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    thanks codeplug, I'm not familiar with those libraries but I'll try looking them up because your solution looks much nicer then mine.... I ended up using strtok() for now until I think of something else, and I also ended up writting partially in C....why is it that some stuff is so much easier in C????? anyways here is what I did:

    Code:
    void getCommand()
    {
    	int firstVal = 0;	//these will hold the values following each command 
    	int secondVal = 0;	//except create, setids, and quit
    	int x, i=0;			//simple counter
    	char buff[256];		//buffer for creation of a set
    	char *p;
    
    	Sets object;		
    	string command;		//holds the first word of the user inputed command
    	string set;
    	
    	cout << ">  ";
    	cin >> command;
    
    	//create a set
    	if( command == "create" )
    	{
    		cout << endl << command;
    		
    		gets( buff );
    		p = strtok( buff, " " );
    
    		while( p != NULL )
    		{
    			if( sscanf( p, "%d", &x ) )
    				cout << p;
    			else
    				printf( "error on token %d: integer expected" );
    
    			i++;
    			p = strtok( NULL, " " );
    		}
    	}
    any other suggestions are more then welcome!

    edit:: the above code is partially made for debugging; the actual int is sent to an array in the program

    some entropy with that sink? entropysink.com

    there are two cardinal sins from which all others spring: Impatience and Laziness. - franz kafka

  4. #4
    Registered User axon's Avatar
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    codeplug I've run your code, and you either misuderstood what I ment or there is something wrong with the code itself.

    When I (user) input any set of ints, it still prints out 1,2,.....9

    can you explain the consept of your code for me a bit?

    some entropy with that sink? entropysink.com

    there are two cardinal sins from which all others spring: Impatience and Laziness. - franz kafka

  5. #5
    End Of Line Hammer's Avatar
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    Another way
    Code:
    #include <iostream>
    #include <vector>
    
    int main(void)
    {
      std::vector<int> myArray;
      std::string command;
      int i;
      
      std::cin >> command;
      std::cout <<"Running command: " <<command <<std::endl;
      while (std::cin >> i && i != -1)
      {
        myArray.push_back(i);
      }
    
      for (std::vector<int>::iterator it = myArray.begin(); it != myArray.end(); ++it )
      {
        std::cout <<*it <<" ";
      } 
      
      std::cout <<std::endl;
      
      return(0);
    }
    
    
    /* 
    My input/output:
    
    blahblah 1 2 3 4 5 -1
    Running command: blahblah
    1 2 3 4 5
    
    */
    With the stringstreams, you have to read the input in a string first, then pass that string to a stringstream. This might help (loosely!)
    http://faq.cprogramming.com/cgi-bin/...&id=1043284385
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  6. #6
    Registered User axon's Avatar
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    Thanks Hammer, I've also seldom worked with vectors but they are much more familiar to me then what codeplug showed. Anyways, is there a way of setting the limit to the while loop to be a return (newline) rather then a '-1'?

    some entropy with that sink? entropysink.com

    there are two cardinal sins from which all others spring: Impatience and Laziness. - franz kafka

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