A string constant consists of zero or more character enclosed in quotation marks. Several string constants are given below.
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There is a difference between the constant ‘A’ and “A” in C, the first ‘A’ is a character constant while the second “A” is string constant. The notation ‘A’ is a constant occupying a single byte containing the ASCII code of the character A. The notation “A” on the other hand ,is a constant that occupies two bytes one for ASCII code of A and another for the null character with the value 0,that terminates all the string.