Which of the datatypes have size that is variable?

Which of the datatypes have size that is variable?

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1) What will be the output of the following C code?

 #include <stdio.h>
 int main()
 {
    float f1 = 0.1;
    if (f1 == 0.1)
       printf("equal\n");
    else
       printf("not equal\n");
 }

2) Which of the following is not a valid declaration in C?

3) Data type qualifiers can be classified into?

4) For 16-bit compiler allowable range for integer constants is ________?

5) What is Enum datatype syntax?