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Editorial Team
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Asked: 2026-06-12T05:00:29+00:00

Using atoi() while reading from a file and it is dropping the first 0

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Using atoi() while reading from a file and it is dropping the first 0 in some of the zip codes, for example:

int x = atoi("06461");

seems to be saving x = 6461. Is dropping non significant 0’s part of the atoi function?

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1 Answer

  1. Editorial Team

    It doesn’t drop zero. It stores the number. And as a number (decimal) 06461 and 6461 is exactly the same value. It’s up to you how to present the number — with (printf("%05d",zip)) or without (%d in case of printf) leading zero.

    P.S. Note, that c folks are mightily confused by leading zeros, they tend to see numbers as octal then.
    P.P.S. And I fully support Joachim’s comment to your question.

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