INDEX.md

Plus Minus

Given an array of integers, calculate the ratios of its elements that are positive, negative, and zero.

Print the decimal value of each fraction on a new line with 6 places after the decimal.

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Note:

This challenge introduces precision problems. The test cases are scaled to six decimal places, though answers with absolute error of up to $10^{-1}$ are acceptable.

Example:

• inputArray = [1, 1, 0, -1, -1]
• There are n = 5 elements, two positive, two negative and one zero. Their ratios are $\frac{2}{5} = 0.400000$, $\frac{2}{5} = 0.400000$ and $\frac{1}{5} = 0.200000$.
• Results are printed as:
  • 0.40000
  • 0.40000
  • 0.20000

Function Description:

• Complete the plusMinus function in the editor below.
• plusMinus has the following parameter(s):
  • inputArray[n]: an array of integers

Print:

• Print the ratios of positive, negative and zero values in the array.
• Each value should be printed on a separate line with digits after the decimal.
• The function should not return a value.

Input Format:

• The first line contains an integer, n, the size of the array.
• The second line contains n space-separated integers that describe inputArray[n].

Constraints:

• $0 \le n \le 100$
• $-100 \le inputArray[i] \le 100$

Output Format:

• Print the following 3 lines, each to 6 decimals:

  1. proportion of positive values
  2. proportion of negative values
  3. proportion of zeros

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Sample Input:

STDIN           Function
-----           --------
6               inputArray[] size n = 6
-4 3 -9 0 4 1   inputArray = [-4, 3, -9, 0, 4, 1]

Sample Output:

0.500000
0.333333
0.166667

Explanation:

• There are 3 positive numbers, 2 negative numbers, and 1 zero in the array.
• The proportions of occurrence are:
  • positive: $\frac{3}{6} = 0.500000$
  • negative: $\frac{2}{6} = 0.333333$
  • zeros: $\frac{1}{6} = 0.166667$

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Solution:

• Code
• Tests