In Text File Some Of The Passage.In That I Want To Find "One Thousand Hundred" And Replace As "#"

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VisualC++

please give code for this

Before:
And the number of this mighty army, it is said, were two hundred thousand thousand; or "two myriads of myriads"; two hundred millions, or twenty thousand brigades of ten thousand each


output(After):

And the number of this mighty army, it is said, were #; or "two myriads of myriads"; #, or # brigades of # each;