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numeric_limits::digits10

Returns the number of decimal digits that the type can represent without loss of precision.

static const int digits10 = 0;

The number of decimal digits that the type can represent without loss of precision.

// numeric_limits_digits10.cpp
// compile with: /EHsc
#include <iostream>
#include <limits>

using namespace std;

int main( )
{
   cout << numeric_limits<float>::digits10 <<endl;
   cout << numeric_limits<double>::digits10 <<endl;
   cout << numeric_limits<long double>::digits10 <<endl;
   cout << numeric_limits<int>::digits10 <<endl;
   cout << numeric_limits<__int64>::digits10 <<endl;
   float f = (float)99999999;
   cout.precision ( 10 );
   cout << "The float is; " << f << endl;
}
6
15
15
9
18
The float is; 100000000

Header: <limits>

Namespace: std

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