Lab assignment # $5$

Topics: class, object, instantiation, basic inheritance

Problem Statement: The purpose of this lab assignment is to gain experience in pythons

inheritance feature

Your Task:

$1.$ Create a class called Rectangle

a$.$ Rectangle will contain $2$ sides: Length and Width

b$.$ Create the following methods for this class

i$.\_\_$init$\_\_($self$,$ length, width$)$ will initialize the length and width of the

rectangle

ii$.\_\_$str$\_\_($self$)$ will print the dimension of the rectangle $($please refer to

sample output below$)$

iii. area$($self$)$ will compute and return the area of the rectangle

iv$.$ increase$\_$size$($self$,$ l$,$ w$)$ will take in two parameter l and w$.$ It will

increase length of rectangle by l units and width of rectangle by w units

$2.$ Create a class called Cuboid. This class will be a sub$-$class of Rectangle.

a$.$ Cuboid will contain $3$ sides: Length and Width $($inherited from Rectangle$)$ and

additional attribute Depth.

b$.$ Create the following methods for this class

i$.\_\_$init$\_\_($self$,$ length, width, depth$)$ will initialize the length, width, and

depth of the cuboid.

ii$.\_\_$str$\_\_($self$)$ will print the dimensions of the cuboid

iii. volume$($self$)$ will compute the volume of the cuboid

iv$.$ increase$\_$size$($self$,$ l$,$ w$,$ d$)$ will take three parameters l$,$ w$,$ and d$.$ It will

increase the length by l units, width by w units, and depth by d units.

c$.$ All methods will require to use of the super$()$ function. Not using this function in

your solution will be counted as incorrect implementation.

$3.$ Object creation:

a$.$ Create a rectangle object r$1$ with dimension length $=1$ and width $=2$

i$.$ Print r$1$

ii$.$ Print its area

iii. Increment its dimensions by $1$

iv$.$ Print r$1$ again

v$.$ print its new area

b$.$ Create a cuboid object c$1$ with dimension length $=1,$ width $=2$ and depth $=3$

i$.$ Print c$1$

ii$.$ Print its volume

iii. Increment its dimensions by $1$

iv$.$ Print c$1$ again

v$.$ Print its new volume

Sample Output

length $=1$

width $=2$

Initial area of r$1$ is $2$

length $=2$

width $=3$

New area of r$1$ is $6$

length $=1$

width $=2$

depth $=3$

Initial volume of c$1$ is $6$

length $=2$

width $=3$

depth $=4$

New area of c$1$ is $24$

Submission:

$1.$ All submission will be via Blackboard during the lab time

$2.$ You can take help from the GTA and$/$or you can look at the class resources: lecture

slides, class note, python documentation.

$3.$ The codes need to be written in the firstname$\_$lastname$\_$LA$5.$py file.