A constant is a number, written so that its value is known by inspection,
without knowing any context, like the following input example.
.byte 74, 0112, 092, 0x4A, 0X4a,’J, ’\J # All the same value.
.ascii "Ring the bell\7" # A string constant.
.octa 0x123456789abcdef0123456789ABCDEF0 # A bignum.
.float 0f-314159265358979323846264338327\
95028841971.693993751E-40 # - pi, a flonum.