How to count the frequency of bundle of number using c#?

Question

Can somebody help me to run this program using c#. This program is to calculate the frequency of the number, for example 12 appear 10x. Before this I try to sort all list

Answer 1

I would use a dictionary of int and int: Dictionary and iterate through the numbers adding 1 as you go. some solutions use an array, but I prefer a dictionary this eliminates the need to manage the size of the array and is more memory efficient.

int[] someValues = { /* your numbers */ }
Dictionary Counts = new Dictionary();
foreach(int key in someValues)
{
    if ( !Counts.HasKey(key) ) Counts[ key ] = 0;
    Counts[key] = Counts[key] + 1;
}

then, you just iterate over the dictionary for your output:

foreach(KeyValuePair kvp in Counts)
{
    Console.Write("{0} - {1}",kvp.Key,kvp.Value);
}