bash-calc.sh

#!/bin/bash

#use this when on star
#use regular when on hive
# This is intended to be an include file 
# and not executed as a script 
# dependencies bc 1.06
if [ -f  ~cs9e-1/bin/arch/sun4u/bc ]; then
  alias bc="~cs9e-1/bin/arch/sun4u/bc" #expecting bc 1.06
fi

# bashcalc <expression>
# This function simply passes in the given expressions to 'bc -l' and
#prints the result
. assert.sh
function bashcalc {
  echo "$1" | bc -l
 }

# sine <expression>
# This function prints the sine of the given expression
function sine {
    echo "s ($1)" | bc -l
}

  # cosine <expression>
  # This function prints the cosine of the given expression
function cosine {
  echo "c ($1)" | bc -l
}

# angle_reduce <angle>
# Prints the angle given expressed as a value between 0 and 2pi
function angle_reduce {
  pipi=$(echo "8*a(1)" | bc -l)
  integr=$(echo "scale = 0;$1/$pipi" | bc -l)
  ans=$(echo "$1 - $integr*$pipi" | bc -l)
  if [ $(float_lte $ans 0) -eq 1 ]; then
    ans=$( echo "$ans + $pipi" | bc -l)
  fi
  echo "$ans"
}

function float_lte {
  echo $1 '<='  $2 | bc -l

}

function float_lt {
  echo $1 '<'  $2 | bc -l

}
function float_eq {
  echo $1 '==' $2 | bc -l
}

#additional functions not required 
function float_gt {
  echo $1 '>'  $2 | bc -l

}
function float_gte {
  echo $1 '>='  $2 | bc -l

}


function add {
  echo $1 '+' $2 | bc -l
}
function subtract {
  echo $1 '-' $2 | bc -l
}
function multiply {
  echo $1 '*' $2 | bc -l
}
function divide {
  echo $1 '/' $2 | bc -l
}

#=== Tests ===#
PI=$(echo "4*a(1)" | bc -l)
THREE_PI=$(echo "3*$PI" | bc -l)
NEG_THREE_PI=$( subtract 0 $THREE_PI )
cond="$(float_eq $(angle_reduce $THREE_PI) $PI) -eq 1" 
cond="$(float_eq $(angle_reduce $NEG_THREE_PI) $PI) -eq 1" 
assert "$cond" $LINENO