Which of the datatypes have size that is variable?

Which of the datatypes have size that is variable?

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1) Which is correct with respect to size of the datatypes?

2) Which of the data types has the size that is variable?

3) What will be the output of the following C code on a 32-bit machine?

 #include <stdio.h>
 int main()
 {
     int x = 10000;
     double y = 56;
     int *p = &x;
     double *q = &y;
     printf("p and q are %d and %d", sizeof(p), sizeof(q));
     return 0;
 }

4) Character literals in C syntax are?

5) What is Enum datatype syntax?