cout or printf which of the two has a faster execution speed C++?

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Each has its own overheads. Depending on what you print, either may be faster.

Here are two points that come to mind –

printf() has to parse the “format” string and act upon it, which adds a cost.
cout has a more complex inheritance hierarchy and passes around objects.

In practice, the difference shouldn’t matter for all but the weirdest cases. If you think it really matters – measure!

EDIT –
Oh, heck, I don’t believe I’m doing this, but for the record, on my very specific test case, with my very specific machine and its very specific load, compiling in Release using MSVC –

Printing 150,000 “Hello, World!”s (without using endl) takes about –
90ms for printf(), 79ms for cout.

Printing 150,000 random doubles takes about –
3450ms for printf(), 3420ms for cout.

(averaged over 10 runs).

The differences are so slim this probably means nothing…

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