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Is 039 a legal integer constant in C language?
039 is an incorrect C language plastic constant.

In c language, the number starting with 0 represents octal, and octal has only 8 numbers, 0~7.

If you want to use 10 to represent 39, write it directly as 39.

If you want to represent an octal number, then this 9 is an illegal number.

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