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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