A positive number is any number greater than 0 (0 is neither positive or negative). Positive numbers may be written with the positive sign (+). A nonzero number written without a sign is also considered positive.
A positive integer on the other hand, is a number that can be written without a fractional component that is greater than 0.
Body temperature for humans is 98.6°F. The elevation of Mt. McKinley is +20,320 feet, or 20,320 feet above sea level.