Finding mode in array of numbers

This is a discussion on Finding mode in array of numbers within the C++ Programming forums, part of the General Programming Boards category; Hello, I'm having a problem finding the mode of numbers in an array. Here's what I have so far - ...

  1. #1
    Registered User
    Join Date
    Jan 2006
    Posts
    1

    Finding mode in array of numbers

    Hello,

    I'm having a problem finding the mode of numbers in an array. Here's what I have so far - the problem is in the findMode function? findMode returns a number, but it's not the mode. No idea what it is. My brains are fried, I've spent way too much time on this program already. It's relatively simple, but I just can't figure it out.

    Code:
    #include <iostream>
    using namespace std;
    
    void userArray();
    void showArray(float [], int);
    float findMode(float [], int);
    
    int main()
    {
    
    	// Function for array of integers
    	float *values;
    	int size;
    
    	cout << "Enter size of array: ";
    	cin >> size;
    	cout << endl;
    
    	// dynamically generated
    	values = new float[size];
    
    	cout << "Enter " << size << " elements, one after the other." << endl;
    
    	for (int count = 0; count < size; count++)
    	{
    		cout << "Element " << (count + 1) << ": ";
    		cin >> values[count];
    	}
    
    
    	// Mode, show
    	cout << endl;
    
    	if (findMode(values, size) == -1)
    	{
    		cout << "No mode." << endl;
    	}
    
    	else
    	{
    		cout << findMode(values, size) << endl;
    	}
    
    	return 0;
    }
    
    float findMode(float *array, int elems)
    {
    	   int lastnum = array[0];
    	   int curlen = 1;
    	   int mode = array[0];
    	   int modelen = 1;
    	   for(int i = 1; i < elems; i++)
    	   {
    		   if (array[i] == lastnum)
    			   curlen++;
    		   else
    		   {
    			   if (curlen > modelen)
    			   {
    				   modelen = curlen;
    				   mode = lastnum;
    			   }
    			   lastnum = array[i];
    			   curlen = 1;
    		   }
    	   }
    
    	return mode;
    }

  2. #2
    Registered User
    Join Date
    Aug 2005
    Posts
    1,267
    probably because array is array of floats, but lastnum and mode are ints. change them to floats.

    From statistics, mode is the most frequently occuring value. So the program should keep track of the number of times each value in array occurs, and you will need another array to do that. std::map<float,int> is good for that.

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