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Asked: 2026-05-26T12:36:01+00:00

If I defined a char buffer like below char buffer[20] = foo; then buffer[0]

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If I defined a char buffer like below 

char buffer[20] = "foo";

then 

buffer[0] == 'f';
buffer[1] == 'o';
buffer[2] == 'o';
buffer[3] == 0;

What does the standard say about buffer[4] to buffer[19]. Are they guaranteed to be intialized to zero as well ?

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1 Answer

  1. Editorial Team

    All remaining elements guaranteed to be intialized to zero.

    Reference:
    C++03 Standard section 6.7.8 para 21:

    If there are fewer initializers in a brace-enclosed list than there are elements or members of an aggregate, or fewer characters in a string literal used to initialize an array of known size than there are elements in the array, the remainder of the aggregate shall be
    initialized implicitly the same as objects that have static storage duration.

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