'''  Purpose: demonstrate arithmetic and use of variables
        for naming things
'''

# name some values
a = 13
b =  5

print( "a =", a )
print( "b =", b )

input()

# display some integer calculations
print( 'Integer arithmetic' )

total        = a +  b
difference   = a -  b
product      = a *  b
dec_quotient = a /  b
int_quotient = a // b
remainder    = a %  b
power        = a ** b

print(  'a + b  =', total )
print(  'a - b  =', difference )
print(  'a * b  =', product )
print(  'a / b  =', dec_quotient )
print(  'a // b =', int_quotient )
print(  'a % b  =', remainder )
print(  'a ** b =', power )

input()

# introduce some other built-in functions
print( 'Some handy functions' )
c =  -10
d = 1.75
e = -1.75

print( "c =", c )
print( "d =", d )
print( "e =", e )

input()

abs_c = abs( c )
float_c = float( c )
int_d = int( d )

print( 'abs( c )   =',  abs_c )
print( 'float( c ) =', float_c )
print( 'int( d )   =', int_d )

print()