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Jump to PostOn current implementations, you'll probably find that the stdio library is faster than the iostream library. The usual recommendation is to try both and use the one that's fastest on your setup, if all you care about is execution performance.
Jump to PostExcept which one is "fastest on the current setup" is a moving goalpost with every patch / update / release / new compiler.
Plus if you're writing code which is in any way open source, then a whole raft of different compiler options will appear, each with their own …
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