How to get the string size in bytes?

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You can use strlen. Size is determined by the terminating null-character, so passed string should be valid.

If you want to get size of memory buffer, that contains your string, and you have pointer to it:

  • If it is dynamic array(created with malloc), it is impossible to get
    it size, since compiler doesn’t know what pointer is pointing at.
    (check this)
  • If it is static array, you can use sizeof to get its size.

If you are confused about difference between dynamic and static arrays, check this.

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