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Full Discussion: Simple calculator with menu input - Need Help
Top Forums Shell Programming and Scripting Simple calculator with menu input - Need Help Post 302757455 by rdrtx1 on Thursday 17th of January 2013 02:09:10 PM
Old 01-17-2013
Not sure what operation 'equals' would do, but try:
Code:
#!/bin/bash
n1=ans
while [ -n "$n1" ]
do
   read -p "what's the first number? (return to exit)" n1
   [[ -n "$n1" ]] && {
      PS3="what's the operation? "
      select ans in add subtract multiply divide exp; do
         case $ans in
            add) op='+' ; break ;;
            subtract) op='-' ; break ;;
            multiply) op='*' ; break ;;
            divide) op='/' ; break ;;
            exp) op='^' ; break ;;
            *) echo "invalid response" ;;
         esac
      done
      read -p "what's the second number? " n2
      ans=$(echo "$n1 $op $n2" | bc -l)
      printf "%s %s %s = %s\n\n" "$n1" "$op" "$n2" "$ans"
   }
done
 
exit 0

Last edited by rdrtx1; 01-17-2013 at 03:24 PM..
 

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LEARN ABOUT DEBIAN

break

break(3tcl)						       Tcl Built-In Commands						       break(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       break - Abort looping command

SYNOPSIS

       break
_________________________________________________________________

DESCRIPTION

       This command is typically invoked inside the body of a looping command such as for or foreach or while.	It returns a TCL_BREAK code, which
       causes a break exception to occur.  The exception causes the current script to be aborted out to the  innermost	containing  loop  command,
       which  then aborts its execution and returns normally.  Break exceptions are also handled in a few other situations, such as the catch com-
       mand, Tk event bindings, and the outermost scripts of procedure bodies.

EXAMPLE

       Print a line for each of the integers from 0 to 5:
	      for {set x 0} {$x<10} {incr x} {
		 if {$x > 5} {
		    break
		 }
		 puts "x is $x"
	      }

SEE ALSO

       catch(3tcl), continue(3tcl), for(3tcl), foreach(3tcl), return(3tcl), while(3tcl)

KEYWORDS

       abort, break, loop

Tcl																       break(3tcl)
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