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Converting from Centigrade to Fahrenheit and vice versa.

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Top Forums Shell Programming and Scripting Converting from Centigrade to Fahrenheit and vice versa.
# 8  
Old 04-29-2012
methyl, you got rid of the syntax error but now the output file only shows -17 in the centigrade column and nothing in the fahrenheit column when I select to go from centigrade to fahrenheit.
# 9  
Old 04-29-2012
@NickNak
No intention to address the syntax error because you have not posted the syntax error. I was addressing the mathematics.

Please post the current version of the script complete with sample input and expected output. I can see a definite conflict between input from the file and and input from the keyboard because as far as Shell is concerned they both come from the same place ... STDIN.
# 10  
Old 04-29-2012
I know you weren't trying to fix the syntax error but somehow just by fixing the math the error went away. At any rate, here is the current code and I really do appreciate the help I have received so far, I feel I am learning this stuff little by little and it is great.


Code:
#!/bin/bash
print_dash_line()
{
echo "--------------------     --------------------"
}

input=p3data
output=p3output

echo "1. Convert Centrigade temperature into Fahrenheit temperature."
echo "2. Convert Fahrenheit temperature into Centigrade temperature."
echo -n "Select your choice (1-2): "
read choice;
if [ $choice -eq 1 ]
then
  echo -n "Enter Centrigade Temperature : "
  set `cat $input`
  echo " Centigrade Temperature      Fahrenheit Temperature " > ${output}
  print_dash_line >> ${output}
  while read ct
  do
    ct=$(echo "scale=2; (5/9)*($ft-32)" |bc)
    echo "             $ct                        $ft " >> $output
    print_dash_line >> $output
  done < ${input}
elif
  echo -n "Enter Fahrenheit Temperature : "
  echo " Fahrenheit Temperature      Centigrade Temperature " > ${output}
  print_dash_line >> ${output}
  while read ft
  do
    ft=$(echo "scale=2; ((($ft -32) * 5) / 9)" |bc)
    echo "             $ft                        $ct " >> $output
    print_dash_line >> $output
  done < ${input}
then
    echo "Please select 1 or 2"
    exit l
fi

# 11  
Old 04-29-2012
Quote:
sample input and expected output
In case you forgot.



Thank you for taking interest in my correction to the mathematical formula, but did you amend the Farenheit or the Centigrade conversion I wonder? Please check your code thoroughly.
This User Gave Thanks to methyl For This Post:
N1ckNak
# 12  
Old 04-29-2012
The current code I have is in post 10. I am not sure why I can't get the data file numbers to come up with the calculated numbers in the output file. The calculation also only works f2c. C2f only gives me 11 lines of -17.77. I feel like I am missing just a couple of minor things here but I just can't crack em.
# 13  
Old 04-29-2012
There are a number of errors in the script. The main problem is "while read ct" where the script calculates $ct not $ft and again "while read ft" where the script calculates $ft not $ct. !

Try this (I have removed various spurious lines like "set `cat $input`" and two spurious "echo enter" lines.

Also corrected the spelling of Centigrade and corrected the calculation from Centigrade to Fahrenheit.

Also changed the erroneous "if" test to a "case" statement.

Code:
#!/bin/bash
print_dash_line()
{
echo "--------------------     --------------------"
}

input=p3data
output=p3output

echo "1. Convert Centigrade temperature into Fahrenheit temperature."
echo "2. Convert Fahrenheit temperature into Centigrade temperature."
echo -n "Select your choice (1-2): "
read choice
case "$choice" in
1)
  echo " Centigrade Temperature      Fahrenheit Temperature " > ${output}
  print_dash_line >> ${output}
  while read ct
  do
    ft=$(echo "scale=2; ((($ct * 9) / 5) + 32)" |bc)
    echo "             $ct                        $ft " >> $output
    print_dash_line >> $output
  done < ${input}
;;
2)
  echo " Fahrenheit Temperature      Centigrade Temperature " > ${output}
  print_dash_line >> ${output}
  while read ft
  do
    ct=$(echo "scale=2; ((($ft -32) * 5) / 9)" |bc)
    echo "             $ft                        $ct " >> $output
    print_dash_line >> $output
  done < ${input}
;;
*)
    echo "Please select 1 or 2"
    exit l
esac

Last edited by methyl; 04-29-2012 at 07:38 PM..
This User Gave Thanks to methyl For This Post:
N1ckNak
# 14  
Old 04-29-2012
Oh cool the F2C works seemingly very well. There must be a small problem with the C2F formula though because I get a syntax error that reads: (standard_in) 1: syntax error. I have tried rearranging that formula and have tried a different variation of it but I get the same error.


Code:
#!/bin/bash
print_dash_line()
{
echo "-----------------------     -----------------------"
}

input=p3data
output=p3output

echo "1. Convert Centigrade temperature into Fahrenheit temperature."
echo "2. Convert Fahrenheit temperature into Centigrade temperature."
echo -n "Select your choice (1-2): "
read choice
case "$choice" in
1)
  echo " Centigrade Temperature      Fahrenheit Temperature " > ${output}
  print_dash_line >> ${output}
  while read ct
  do
    ft=$(echo "scale=2; ((($ct * 9) / 5) +32)" |bc)
    echo "             $ct                        $ft " >> $output
    print_dash_line >> $output
  done < ${input}
;;
2)
  echo "Fahrenheit Temperature     Centigrade Temperature " > ${output}
  print_dash_line >> ${output}
  while read ft
  do
    ct=$(echo "scale=2; ((($ft -32) * 5) / 9)" |bc)
    echo "             $ft               $ct " >> $output
    print_dash_line >> $output
  done < ${input}
;;
*)
    echo "Please select 1 or 2"
    exit l
esac

Last edited by N1ckNak; 04-29-2012 at 10:09 PM..
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