About to!int

bearophile bearophileHUGS at lycos.com
Mon Jan 30 18:01:38 PST 2012

In Python int() and float() convert a string into a number even if it contains some whitespace before and after the number:

>>> s = " 12\n"
>>> int(s)
>>> float(s)

In D  to!int(" 12\n")  gives a run-time error. So time ago I have weakly asked Andrei to change to!int, to let it ignore leading and trailing whitespace, but he has ignored my request.

A leading newline comes often from input stdin.readln() and other sources. So in D you need to add a strip():

int n = to!int(stdin.readln().strip());

I sometimes forget to add the strip(). Do you know why Andrei has not appreciated the idea of to!int and similar functions to ignore leading and trailing whitespace?


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