Greatest integer function returns the largest integer values less than or equal to that number
for example : [7.7] = 7
[2.6] = 2
[-6.3] = -7
We round the number to the nearest whole number less than the given number
Evaluate [4.8]
[4.8] = 4 , nearest whole number less than 4.8 is 4
Evaluate [-2.7]
[-2.7] = -3, nearest whole number less than -2.7 is -3
