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C言語の文字配列の挙動が謎すぎる

Last updated at 2014-07-05Posted at 2014-07-05

char配列で宣言した長さより長い文字列を詰め込んでも普通に動いてしまいます。

なんででしょう・・・

環境:gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)

#include <stdio.h>
#include <string.h>

int main()
{
    char s[2];
    strcpy(s, "very long long string");
    printf("%s\n", s);
    printf("strlen = %d\n", (int)strlen(s));
    printf("size = %d\n", (int)sizeof(s));
    return 0;
}

実行結果

very long long string
strlen = 21
size = 2

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