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6. 

By default a real number is treated as a
A. float
B. double
C. long double
D. far double
7. 

Which of the following is not user defined data type?

1 : 
struct book
{
    char name[10];
    float price;
    int pages;
};
2 : 
long int l = 2.35;
3 : 
enum day {Sun, Mon, Tue, Wed};

A. 1
B. 2
C. 3
D. Both 1 and 2
8. 

Is the following statement a declaration or definition?
extern int i;
A. Declaration
B. Definition
C. Function
D. Error
9. 

Identify which of the following are declarations

1 : extern int x;
2 : float square ( float x ) { ... }
3 : double pow(double, double);

A. 1
B. 2
C. 1 and 3
D. 3
10. 

In the following program where is the variable a getting defined and where it is getting declared? 

#include<stdio.h>
int main()
{
    extern int a;
    printf("%d\n", a);
    return 0;
}
int a=20;

A. extern int a is declaration, int a = 20 is the definition
B. int a = 20 is declaration, extern int a is the definition
C. int a = 20 is definition, a is not defined
D. a is declared, a is not defined