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What happens when no argument is supplied to set() function?

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What happens when no argument is supplied to set() function?

(a) All alternate bits are set to 1 in a bitset

(b) All bits are set to 0 in a bitset

(c) All bits are set to 1 in a bitset

(d) First bit is set to 1

The question was posed to me in an online quiz.

The question is from Bitset in chapter Class Hierarchies, Library & Containers of C++

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The correct option is (c) All bits are set to 1 in a bitset

The explanation: When no argument is supplied to set() function i.e. function is called with empty parameters then all the bits of the bitset is set to 1.

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