C++ MQCs with Explanation ( MANAGING CONSOLE I/O OPERATIONS )

What would be the output of the following code segment? cout.setf(ios:: showpos); cout.precision(2); cout<< 345.609

1. 345.60
2. +345.61
3. +345.6
4. +345.609

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Answer: 

Option b: +345.61

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Explanation Here