Does the working of sizeof operator different in c andd c++ [duplicate]

Question

I have written a small printf statement which is working different in C and C++:

    int i;
    printf ("%d %d %d %d %d \n", sizeof(i), sizeof('A'), sizeof(sizeof('A')),    sizeof(float), sizeof(3.14));

The output for the above program in c using gcc compiler is 4 4 8 4 8

The output for the above program in c++ using g++ compiler is 4 1 8 4 8

I expected 4 1 4 4 8 in c. But the result is not so.

The third parameter in the printf sizeof(sizeof('A')) is giving 8

Can anyone give me the reasoning for this

Answer 1

It's nothing to do with the sizeof operator in particular; rather, the size of character literals in C is different than C++, because character literals in C are of type int, whereas in C++ they are of type char.

See Why are C character literals ints instead of chars? for more information.