How to get precision after decimal point for a perfect square

#1

suppose the input is 100 .If I want the squareroot of this to be printed as 10.00
What modification should I do in following code:

#2

@sk1 double pi = 3.14159, npi = -3.14159;

cout << fixed << setprecision(2) << pi << " " <<npi<<endl;

#3

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