How to detect zero crossing between adjacent elements in an array sequentially?

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To detect zero crossings between adjacent elements in an array sequentially, you can iterate through the array and compare each element with its adjacent element. If the product of the elements is negative, then a zero crossing has occurred. Here's an example code:

double[] arr = {-1.2, 3.4, 0.0, -2.1, -5.6, 7.8};
int zeroCrossings = 0;

for (int i = 0; i < arr.length - 1; i++) {
    if (arr[i] * arr[i+1] < 0) {
        zeroCrossings++;
    }
}

System.out.println("There are " + zeroCrossings + " zero crossings in the array.");

In this code, we initialize an array of doubles arr, which contains some positive, negative and zero values. We also initialize a counter zeroCrossings to count the number of zero crossings.

Then, we loop through the array using a for loop, starting from the first element and ending at the second-to-last element (since we are comparing adjacent elements). For each pair of adjacent elements, we multiply them together and check if the result is negative. If it is, we increment the zeroCrossings counter.

Finally, we print out the total number of zero crossings detected in the array.