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Write a C program to count frequency of each element in an array

robaa
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2022-11-24
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Write a C program to count frequency of each element in an array. Here’s simple program to count frequency of each element in an array in C Programming Language.

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robaa
2022-11-24
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What is an Array ?

Arrays a kind of data structure that can store a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.

 
 

Instead of declaring individual variables, such as number0, number1, …, and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and …, numbers[99] to represent individual variables. A specific element in an array is accessed by an index.

All arrays consist of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element.

Here is source code of the C program to count frequency of each element in an array. The C program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

 

SOURCE CODE : :

/* C program to count frequency of each element in an array */

#include <stdio.h>

int main()
{
    int arr[100], freq[100];
    int size, i, j, count;

    /*
     * Read size of array and elements in array
     */
    printf("Enter size of array: ");
    scanf("%d", &size);

    printf("\nEnter elements in array:  \n");
    for(i=0; i<size; i++)
    {
         printf("\nEnter %d element in array: ",i+1);
        scanf("%d", &arr[i]);
        freq[i] = -1;
    }

    /*
     * Counts frequency of each element
     */
    for(i=0; i<size; i++)
    {
        count = 1;
        for(j=i+1; j<size; j++)
        {
            if(arr[i]==arr[j])
            {
                count++;
                freq[j] = 0;
            }
        }

        if(freq[i]!=0)
        {
            freq[i] = count;
        }
    }

    /*
     * Prints frequency of each element
     */
    printf("\nFrequency of all elements of array : \n");
    for(i=0; i<size; i++)
    {
        if(freq[i]!=0)
        {
            printf("%d occurs %d times\n", arr[i], freq[i]);
        }
    }

    return 0;
}

OUTPUT : :

Enter size of array: 6

Enter elements in array:

Enter 1 element in array: 1

Enter 2 element in array: 2

Enter 3 element in array: 3

Enter 4 element in array: 2

Enter 5 element in array: 1

Enter 6 element in array: 2

Frequency of all elements of array :
1 occurs 2 times
2 occurs 3 times
3 occurs 1 times

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