9 – Best C program to find frequency of array element

#include<stdio.h>
//itvoyagers.in
void feqfun(int a[],int len)
{
    int i,j,temp,count=0;
    for(i=0;i<len;i++)
    {
        if(a[i]!=(int)NULL)
        {
            temp=a[i];
            for(j=0;j<len;j++)
            {
                if(temp==a[j])
                {
                    count++;
                    a[j]=(int)NULL;
                }
//itvoyagers.in
            }
        }
        else
        {
            continue;
        }
        printf("nFrequency of %d is %d",temp,count);
        count=0;
    }
}
//itvoyagers.in
int main()
{
    int nums[] = {1,2,5,4,5,2,1,5,2,2,4};
    int l = sizeof(nums)/sizeof(float);
    feqfun(nums,l);
}
//itvoyagers.in