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update average.java #1423

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Merged
drabbit75 merged 3 commits into from
Aug 18, 2020
Merged

update average.java #1423

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5070a0b
Create FindAverage.java
drabbit75 Aug 17, 2020
9486101
Revert "Create FindAverage.java"
drabbit75 Aug 18, 2020
94a6596
Update Average.java
drabbit75 Aug 18, 2020
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26 changes: 22 additions & 4 deletions Maths/Average.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,13 @@
* Calculate average of a list of numbers
*/
public class Average {
private static final double SMALL_VALUE = 0.00001f;
public static void main(String[] args) {
assert average(new double[]{3, 6, 9, 12, 15, 18, 21}) == 12;
assert average(new double[]{5, 10, 15, 20, 25, 30, 35}) == 20;
assert average(new double[]{1, 2, 3, 4, 5, 6, 7, 8}) == 4.5;
assert Math.abs(average(new double[]{3, 6, 9, 12, 15, 18, 21}) - 12) < SMALL_VALUE;
assert Math.abs(average(new double[]{5, 10, 15, 20, 25, 30, 35}) - 20) < SMALL_VALUE;
assert Math.abs(average(new double[]{1, 2, 3, 4, 5, 6, 7, 8}) - 4.5) < SMALL_VALUE;
int[] array = {2, 4, 10};
assert average(array) == 5;

@StepfenShawn StepfenShawn Aug 18, 2020

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 assert average(new int[]{2, 4, 10}) == 5;

@drabbit75 drabbit75 Aug 18, 2020

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it is also ok

}

/**
Expand All @@ -23,4 +26,19 @@ public static double average(double[] numbers) {
}
return sum / numbers.length;
}
}

/**
* find average value of int array
*
* @param array the array contains element and the sum does not
* excess long value limit
* @return average value
*/
public static int average(int[] array) {
long sum = 0;
for (int i = 0 ; i < array.length; ++i) {
sum += array[i];
}
return (int)(sum / array.length);
}
}