Top down approach to design a program.
For example you want to have a program to cook a cake. First you write down big blocks in just a few words (high level of abstraction).
--
Go to the shop
But ingredients
Get back home
Cook the cake
--
After you have everything ready at high level of abstraction, you work on details of each block/module
--
Go to the shop
Go out
Sit in you car
Drive to the shop
bla bla
...
But ingredients
Get back home
Cook the cake
--
top-down design
When a programmer breaks down a problem into a series of high-level tasks and continues to break each task into successively more detailed subtasks, this method of algorithm creation is called:
A sequential algorithm has the following characteristics:a dependence on the standard environment,a relevant name,a main method (function/subroutine) with no parameters,supplementary methods using a top-down modular design,input of boolean values,output exemplifying the relevant criteria.
some programmers think breaking the process into smaller parts allows them to better understand what the procedure being programmed does
The top-down design starts from the start of the program and tracks down all steps but the step wise refinement is backwards.
top-down design
When a programmer breaks down a problem into a series of high-level tasks and continues to break each task into successively more detailed subtasks, this method of algorithm creation is called:
A sequential algorithm has the following characteristics:a dependence on the standard environment,a relevant name,a main method (function/subroutine) with no parameters,supplementary methods using a top-down modular design,input of boolean values,output exemplifying the relevant criteria.
A "V-model" refers to an entire development process where the design takes a "top down" approach and the testing and implementation starts from the "bottom up".
some programmers think breaking the process into smaller parts allows them to better understand what the procedure being programmed does
Top down Program Design : Begins the design with main or top-level module, and progresses downwards to the lowest level modules or subsystem Bottom down Program Design : Begins the design with the lowest level modules or subsystems, and progresses upward to the main program, module or subsystem.
The top-down design starts from the start of the program and tracks down all steps but the step wise refinement is backwards.
On the basis of modular programming(moduler programming can b used to break up a large program in2 manageable units) the program is designed in top-down approach. As we go towards bottom, the task become simpler ans easy.....
Top down design is the philosophy that you start with the highest level of the system or program design. You define that functionality, perhaps writing stub or dummy routines for each of the next level designs so you can debug and test the top level. Then you proceed to the next level. You repeat the design and debug cycle at that level. If you top level design was adequate and correct, which it should be because you don't really want to go back up and make changes, then focus is only on the second level design. You repeat this process, going further and further down, until you complete the design and coding of the entire system. Assuming that each level of design is correct, it is possible to assign multiple parts of each level to different engineers. So long as the defined interface and requirements of that level are adequately provided, this method works well, and allows you to finish the overall design is less time than it would take one engineer to complete. <><><><><><> Bottom up design is the reverse. You start with the lowest levels of implementation, design and debug them, and then proceed upwards towards the top. This method can also work, but there is greater risk of needing to go back and correct some "missing thing" at one of the lower levels. It is usually effective when the whole system design is known at once, such as in a small implementation that one engineer can handle alone.
what do we call the process of subdividing a problem into smaller sub-program.c programing
Top down approach is based on Chip level flow, If the design is small then we can opt for this approach . Bottom down approach is hierarchical based chip design flow, If our Design is big, then , the chip is divided in to small manageable modules, it is similar to "Divide and Conquer approach", Finish the small manageable modules , so that the run time will be controlled, and then finally integrate in to one-chip.
The duration of Top Design is 3600.0 seconds.