TEORIE:
Fie a un numar real si k un numar intreg.
Atunci [a]=k <=> k<=a<k+1.
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3<=3,4<4, deci [3,4]=3.
6<=6<7, deci [6]=6.
-2<=-2<-1, deci [-2]=-2.
4<=4,7<5, deci [4,7]=4.
1<=rad(3)<2 <=> 3<=rad(3)+2<4, deci [rad(3)+2]=3.
3<=pi<4 <=> 8<=pi+5<9, deci [pi+5]=8.
3<=pi<4 <=> 0<=pi-3<1, deci [pi-3]=0.
