Determine if a number is positive. Return true if the number is greater than zero, and false otherwise.
Examples:
Input: num = 5
Output: true
Explanation: 5 is greater than 0, so return true
Input: num = -2
Output: false
Explanation: -2 is less than 0, so return false
Input: num = 0
Output: false
Explanation: 0 is not greater than 0, so return false
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