Hard real-time systems
Hard real time system is purely deterministic and time constraint system for example users expected the output for the given input in 10sec then system should process the input data and give the output exactly by 10th second. Here in the above example 10 sec. is the deadline to complete process for given data. Hard real systems should complete the process and give the output by 10th second. It should not give the output by 11th second or by 9th second, exactly by 10th second it should give the output. In the hard real time system meeting the deadline is very important if deadline is not met the system performance will fail. Another example is defense system if a country launched a missile to another country the missile system should reach the destiny at 4:00 to touch the ground what if missile is launched at correct time but it reached the destination ground by 4:05 because of performance of the system, with 5 minutes of difference destination is changed from one place to another place or even to another country. Here system should meet the deadline.
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