Is there any way to print at least 20 significant figures in Octave?

I need to print the result of a program with 20 significant figures, but I don't know how to print more than 15开发者_高级运维 figures (format long). Is there any way to achieve this?

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You can control the format of your output with printf, just like in C, by following this syntax with these format specifiers:

> printf('%.20f\n', pi)
3.14159265358979311600