x = '100'
y = '-10.5'

# Variable x and y are strings so the 'plus' operator in this case performs
# the concatentation operation (combines two strings).
print(x + y)

# Converts x and y to numerical form before the 'plus' operator is applied.
# int (x): converts the string 'x' to an integer value.
# float (y): converts the string 'y' to a floating point (real number) value.
# Since the inputs to the operator are now numbers rather than strings, the
# mathematical addition operation is performed.
print(int(x) + float (y))