. "$BST_LIB"
require bc bc/present

# Busybox can provide a bc applet; this suite covers the GNU bc this ticket ships
# (the bc_1.07.1 recipe installs both bc and its dc sibling).
check_out bc/gnu-version "1.07" bc --version

# The ticket's named criterion: an expression on stdin evaluates on stdout.
check_eq bc/power  1024    "$(echo '2^10' | bc)"
check_eq bc/arith  42      "$(echo '6*7' | bc)"
check_eq bc/sqrt   12      "$(echo 'sqrt(144)' | bc)"            # builtin sqrt(), scale 0
check_eq bc/scale  3.3333  "$(echo 'scale=4; 10/3' | bc)"       # fixed-point at scale=4
check_eq bc/obase  FF      "$(echo 'obase=16; 255' | bc)"       # output-base conversion
check_eq bc/mathlib 0      "$(echo 'l(1)' | bc -l)"             # -l loads the math library (ln(1)=0)

# dc is the RPN sibling installed by the same bc package.
if command -v dc >/dev/null 2>&1; then
  check_eq dc/rpn 5 "$(echo '2 3 + p' | dc)"
else
  bst_skip dc/rpn "dc not installed on this image"
fi