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how to get 4 decimal places in c++

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double d = 122.345;
    cout << fixed << setprecision(4) << d;
}
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how to specify the number of decimal places in c++

#include<bits/stdc++.h>
using namespace std;
int main ()
{
    double A, n, R, Square_of_R;
    cin >> R;
    Square_of_R = pow(R,2);
    n = 3.14159;
    A = n * Square_of_R;
    cout << "A=" << fixed << setprecision(4) << A << endl; 
  	//printf("A=%.4lf", A);
    return 0;
}
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