#include <cstdlib> double strtod( const char *start, char **end );
The function strtod() returns whatever it encounters first in start as a double. end is set to point at whatever is left in start after that double. If overflow occurs, strtod() returns either HUGE_VAL or -HUGE_VAL.
x = atof( "42.0is_the_answer" );
results in x being set to 42.0.
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