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  1. #include <iostream>         /// cout
  2. #include <iomanip>          /// setprecision()
  3.  
  4. using namespace std;
  5.  
  6.  
  7. int main()
  8. {
  9.     cout << "cout.precision()="
  10.          << cout.precision() << " : "
  11.          << 123.456 << endl;
  12.  
  13.     cout << "cout.precision()="
  14.          << setprecision(4)
  15.          << cout.precision() << " : "
  16.          << 123.456 << endl;
  17. }
  18.  
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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cout.precision()=6 : 123.456
cout.precision()=6 : 123.5
https://ideone.com/BzKDuE
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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