Question

How to count frequency of each element in an array in C

Answer 1

#include <stdio.h>
 
int main()
{
    int arr[] = {4, 1, 2, 8, 9, 5, 5, 1, 7, 8, 8};
    int frequency[10] = {0};
    int size = sizeof(arr)/sizeof(arr[0]);
      
    for (int i = 0; i < size; i++) {
        frequency[arr[i]]++;
    }
     
    for (int i = 0; i < 10; i++) {
        if (frequency[i])
            printf("%d: - %d times\n", i, frequency[i]);
    }
         
    return 0;
}
    
    
    
    
/*
run:
    
1: - 2 times
2: - 1 times
4: - 1 times
5: - 2 times
7: - 1 times
8: - 3 times
9: - 1 times
      
*/

 

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