Minor question about output formatting flags

How do I output a number such that it's never output in scientific notation, but trailing zeros aren't displayed either? I tried

Code:

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cout << fixed << noshowpoint;

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but it still outputs, say, 90 as 90.00000?

One way is setprecision, but I don't know the best way:

Code:

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#include <iostream>
#include <iomanip>
using namespace std;
 
int main(int cargs, char **vargs) {
  cout << setprecision(0) << 90.0 << endl; // outputs "90"
  return 0;
}

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http://www.cppreference.com/io_flags.html#manipulators

Hmm... setprecision() will cause all numbers to be displayed at the same precision, whereas I need the numbers to be displayed at their default precision, but without trailing zeros.

Basically, I want numbers to be displayed the way they're displayed by default, but without getting into scientific notation when the numbers get big.

Any suggestions?

While I'm not sure exactly which settings you want, you can use resetiosflags to turn off anything you don't want:

Code:

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cout << resetiosflags(ios_base::showpoint | ios_base::scientific | ios_base::fixed) << ...

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I hope this helps.

- Bryan

Hmm... that doesn't really work either. 9000000000000000000.0 is still displayed as 9e018...

Basically this is what I need...

90 to be displayed as 90 (no trailing zeros)
9e18 to be displayed as 9000000000000000000 (not in scientific form)
9.85545 to be displayed as 9.85545 (no precision loss)

Is that possible?