How Many Digits Does a Floating-Point Variable Have?

The standard function template std::numeric_limits (defined in < limits >) returns the implementation-dependent number of digits that a certain type has:

#include int main(){std::numeric_limits < float >::digits10; //6 on my machinestd::numeric_limits < double >::digits10; // 15std::numeric_limits < long double >::digits10; // 18}

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