Float-precision output and floating-point-precision output

Source: Internet
Author: User

Float-precision output and floating-point-precision output

The settings related to the output in C ++ are included in the header file "iomanip". First, let's take a look at some functions contained in it:

To retain the N digits after the decimal point and output the result in rounding, setprecision and fixed are required.

// Eg: calculate the area of the circle whose radius is r; output: retain the seven digits after the decimal point, rounding out the output # include "iostream" # include "iomanip" using namespace std; int main () {const double PI = 3.14159265358979323; int r; cin> r; cout. setf (ios: fixed); cout <setprecision (7) <PI * r; // cout <fixed <setprecision (7) <PI * r; you can return 0 in this way ;}

 

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