Question : Padding strings

How do I pad a variable such that it has 4 characters padded with zero

e.g. 1 become 0001  18 become 0018  567 become 0567 and 7677 stays as it is (dont need to wory about more than 4 characters)

Thanks

Answer : Padding strings

$ cat pad.ksh
#!/bin/ksh
var=18
printf "%04d\n" $var

var=567
printf "%04d\n" $var

var=7677
printf "%04d\n" $var

$ ./pad.ksh
0018
0567
7677