gunter.sh

#!/bin/bash

if [ $# -gt 0 ]
then
max=$1
max=$(( $max + 1 ))
else
max=200
fi

echo '#!/bin/bash'
echo ''
echo "
if [ \$# -ne 1 ]
then
 echo \"please, use \$0 \\\"1 + 3\\\"\"
 exit 1
fi

read -r -a P <<< "\$1"

i="\${P[0]}"
o="\${P[1]}"
j="\${P[2]}"

if [ \$i -lt 0 ] || [ \$i -gt $max ]
then
 echo 'first num >= 0! AND <= $max'
 exit 1
fi

if [ \$j -lt 0 ] || [ \$j -gt $max ]
then
 echo 'second num >= 0! AND <= $max'
 exit 1
fi
if [[ \"\$o\" != \"-\" && \"\$o\" != \"+\" && \"\$o\" != \"*\" && \"\$o\" != \"/\" ]]
then
 echo 'operators allow: - + * /'
 exit 1
fi
"

i=0
while (( $i < $max ))
do
 j=0
 while (( j < $max ))
 do
  echo "if [ \$i -eq $i ]
then
 if [ \$j -eq $j ]
 then"
  for o in {'+','-','*','/'}
  do
   echo "  if [ \"\$o\" = \"$o\" ]
  then"
    if [ "$o" == "/" ] && [ $j -eq 0 ]
    then
 echo "   echo \"Undefined\""
    else
 echo "   echo \"$(($i $o $j))\""
    fi
 echo "  fi"
  done
echo " fi
fi
"
 j=$(($j+1))
 done
i=$(($i+1))
done

[Gunter Calculator]

1. chmod run access:

 [ ololosha-host@ololosha /home/ololosha/ ] chmod a+x ./gunter_generator.sh;

2. generate gunter:

 [ ololosha-host@ololosha /home/ololosha/ ] ./gunter_generator.sh > gunter.sh; chmod a+x gunter.sh

OR

 [ ololosha-host@ololosha /home/ololosha/ ] ./gunter_generator.sh 427 > gunter.sh; chmod a+x gunter.sh

3. run gunter:

 [ ololosha-host@ololosha /home/ololosha/ ] ./gunter.sh 5 / 12