types - Operator sizeof() in C -

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consider program 

main()   {    printf("%d %d %d",sizeof('3'),sizeof("3"),sizeof(3));   }

output gcc compiler is: 

4 2 4

why so?

assuming running on 32-bit system:

sizeof character literal '3' 4 because character literals ints in c language (but not c++).

sizeof "3" 2 because array literal length 2 (numeral 3 plus null terminator).

sizeof literal 3 4 because int.


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