Question 1199882
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The greatest-integer function is also known as the floor function.


Draw a vertical number line. 
Plot the two values 3.4 and 5.7
Feel free to pick other examples.


The 3.4 rounds down to 3
The 5.7 rounds down to 5


We go down to the nearest floor, aka integer.
You can think of it like an elevator in a skyscraper. 


Further Reading:
<a href = "https://www.mathwarehouse.com/algebra/greatest-integer-function-and-graph.php">https://www.mathwarehouse.com/algebra/greatest-integer-function-and-graph.php</a>


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Now to the problem at hand


f(x) = [x/2]
f(pi) = [pi/2]
f(pi) = [1.5707963267949]
f(pi) = 1


Answer: <font color=red size=4>1</font>
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