%F format character

Enter a real number , Output as real for the first time ; Keep it for the second time 2 Decimal output ; Keep it for the third time 3 Decimal places but minimum column width 8 Column output , The blank space to separate .
Format
Input format : Enter real
Output format : Output real , The blank space to separate .
Examples
Input : 31331.14345435
Output : 31331.143454 31331.14 31331.143

#include<bits/stdc++.h> 

using namespace std;

int main( )
{
    double n;
    scanf("%lf", &n);
    printf("%lf %.2lf %8.3lf" ,n,n,n);
    return 0;
}