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