C++ Programming/Code/Standard C Library/Functions/atof

From Wikibooks, open books for an open world
Jump to navigation Jump to search
#include <cstdlib>
double atof( const char *str );

The function atof() converts str into a double, then returns that value. str must start with a valid number, but can be terminated with any non-numerical character, other than "E" or "e". For example,

x = atof( "42.0is_the_answer" );

results in x being set to 42.0.

Related topics
atoi - atol - strtod
(Standard C I/O) sprintf