Does any one know of a atolf c function?

问题:

I am looking for a function similar to atol (char * to long int) but atofl (char to long double), does anyone know of a library that does this, or a simple way to do this, since using atof on "0.00000005" casts off the 5? Thanks.

回答1:

There is a function called strtod that does what you want.

回答2:

I think you have use the wrong argument of printf, so you only saw the console giving you "0.000000", you can try

printf("%0.10f", atof(str_num));

to show the your number, and you will find what you want.