C Exercises: Count the frequency of each element of an array

C Array: Exercise-8 with Solution

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

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>

void main()
{
    int arr1[100], fr1[100];
    int n, i, j, ctr;
	
	
       printf("\n\nCount frequency of each element of an array:\n");
       printf("------------------------------------------------\n");	

       printf("Input the number of elements to be stored in the array :");
       scanf("%d",&n);
   
       printf("Input %d elements in the array :\n",n);
       for(i=0;i<n;i++)
            {
	      printf("element - %d : ",i);
	      scanf("%d",&arr1[i]);
		  fr1[i] = -1;
	    }
    for(i=0; i<n; i++)
    {
        ctr = 1;
        for(j=i+1; j<n; j++)
        {
            if(arr1[i]==arr1[j])
            {
                ctr++;
                fr1[j] = 0;
            }
        }

        if(fr1[i]!=0)
        {
            fr1[i] = ctr;
        }
    }
    printf("\nThe frequency of all elements of array : \n");
    for(i=0; i<n; i++)
    {
        if(fr1[i]!=0)
        {
            printf("%d occurs %d times\n", arr1[i], fr1[i]);
        }
    }
}

Sample Output:

Count frequency of each element of an array:                                                                  
------------------------------------------------                                                              
Input the number of elements to be stored in the array :3                                                     
Input 3 elements in the array :                                                                               
element - 0 : 25                                                                                              
element - 1 : 12                                                                                              
element - 2 : 43                                                                                              
                                                                                                              
The frequency of all elements of array :                                                                      
25 occurs 1 times                                                                                             
12 occurs 1 times                                                                                             
43 occurs 1 times  

Flowchart:

C Programming Code Editor:

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