#!/bin/ksh93

integer iLen=0
integer iHgt=0
integer iPrc=0

while : ; do
     read iLen?"Enter length: "
     (( $iLen <= 0 )) && exit 0
     read iHgt?"Enter height: "
     (( $iHgt <= 0 )) && exit 0
     read iPrc?"Enter price : "
     (( $iPrc <= 0 )) && exit 0

     printf "\nProduct (Length x Height x Price) is: %d\n\n"  $(( iLen * iHgt * iPrc ))
done

exit 0