Answer Posted / madhusudhan

in bottom up approach programmers are interconnecting sub-programms without coming from main program.

main
|
DRIVER
|
sub1
|
sub2
driver is temporary program instead of main, driver activates the connection.

example : in login process, mailing and logout are constructed but login is under contstruction. so they use drivers to login and test.

in Hybrid approach also we use DRIVER.

STUB: is used in top-down approach, while interconnecting the main program and sub programs, in place of remaining which are un-developed programmers use stubs.

main
/ \
sub-b1 stub
| |
sub-b2 sub-a1
here stub stops the process, to sub-programms a1.

thanks for spending

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