Tell me the error in the following code snippets

Question

a. X='l'
y='love'
z='my country'
print (xy z)
b.def square (x):
return x*x
m=square (3,3)
print (m)
c.def add (x,y):
xty
z=add (5,4)
print (z)

Answer 1

Is this homework?
In question "a", there could be 2 or 3 errors depending the way it's actually written.
"b" and "c" probably also have 2 errors.

Answer 2

concatenation.. indentation.. keyword..