Which function should be use to converting string to long double?

In C++, use boost::lexical_cast, or: std::stringstream ss(the_string); long double ld; if (ss >> ld) { // it worked } In C99, use strtold. In C89, use sscanf with %Lg. In C++11 use stold.

There may be subtle differences as to exactly which formats each one accepts, so check the details first...

1 for if (ss >> ld). – Nawaz Sep 12 at 14:33.

Std::stringstream ss(myString); long double x; ss >> x.

In c++, I can only recommend boost::lexical_cast (or in general via the IOStreams). In c? No idea.

Just a hint on C for you Matthieu, all conversions like that, you could do with *printf/*scanf – Shahbaz Sep 12 at 14:22.

You can use istream to read long double from string. See here cplusplus.com/reference/iostream/istream... If you like scanf family of functions, read with %Lf.

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