Answer:
Disadvantages of Batch Operating System:
- The computer operators should be well known with batch systems.
- Batch systems are hard to debug.
- It is sometime costly.
- The other jobs will have to wait for an unknown time if any job fails.
A many periphels can be used
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Year = 1972
current year = 2021
while year <= current year:
print (year)
year = year + 4