Which of the datatypes have size that is variable?

Which of the datatypes have size that is variable?

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1) Integral data type is _________?

2) The C language defines ________ fundamental data types

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) Data type qualifiers can be classified into?

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