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I want to print doubles in decimal notation with full precision (but without extra zeros at the end of the number). In C++ I can use:
std::setprecision(20);
cout << d; // Here d is a double
What would be the equivalent C code using printf?
You can use the “%.20g” specifier. g is IMHO usually better than f since it doesn’t print trailing zeros, and handles large/small values sensibly (changing to e format).
Also note that with the “g” specifier, the precision (the “20” in this case) specifies the number of significant digits rather than the number of digits after the decimal point.