#!/bin/bash
#yy=0
ANOI=1961
ANOF=2012 

#echo -n "Enter year (yyyy) : " 
#read yy 

for ((  yy = $ANOI ;  yy <= $ANOF;  yy++  ))
do
isleap="false"

# find out if it is a leap year or not 

if [ $((yy % 4)) -ne 0 ] ; then 
: # not a leap year : means do nothing and use old value of isleap 
elif [ $((yy % 400)) -eq 0 ] ; then 
# yes, it's a leap year 
isleap="true" 
elif [ $((yy % 100)) -eq 0 ] ; then 
: # not a leap year do nothing and use old value of isleap 
else 
# it is a leap year 
isleap="true" 
fi 


if [ "$isleap" == "true" ]; 
then 
echo "$yy is leap year" 
else 
echo "$yy is NOT leap year" 
fi

done