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by Anonymous on January 26th, 2005

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How can I write a program to create a histogram in C?

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  • by Quirkie on January 26th, 2005

    Quirkie

    That depends a little on what form your data takes.
    The simplest case is if you have a collection of small valued integers in the range 0..N-1 to find the histogram of.
    Create an array int count[N];
    Ensure each element in the array is zero.
    For each input integer item, ++count[item];
    Print out the array, e.g. for(item=0;item<N;++item) printf("item %d, frequency %d n",item,count[item]);

    If you have more complex items like English words in a book to find the histogram of, you need a data structure with elements containing an item and a count. Search the data structure for item and increment its count. If it's not there, add it as a new item with count one.
    There isn't space here to go into various data structures and algorithms.
    Below find a link which includes an implementation of a linked list and how to search through it:

    http://www.cprogramming.com/tutorial/lesson15.html

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