Moving average example in C

movingAverage.c

//Moving average filter implementation in c
#include <stdio.h>

int main() {
    
    const int NUMBERS_SIZE = 10;
    double series[NUMBERS_SIZE] = {10, 20, 30, 40, 50,
                                   60, 70, 80, 90, 100};
    int windowSize = 4;
    double Mem[windowSize];
    double movSum = 0;
    double movAverage = 0;
    int j=0;
    
    for (int i = 0; i < (NUMBERS_SIZE) ; i++) {
        Mem[j]=series[i];
        j += 1;
        j = j & (windowSize-1) ;               
        
        for (int b =0; b <= windowSize; b++) {
            movSum += Mem[b];
        }
        
        movAverage = movSum / windowSize;
        printf("Moving Average = %lf\n", movAverage);
        movSum = 0;
    }      
   return 0;
}