Question

•• R5.9We have seen three kinds of variables in C++: global variables, parameter variables, and local variables. Classify the variables of Exercise •• R5.8 according to these categories.

1 int a = 0;

2 int b = 0;

3 int f(int c)

4 {

5 int n = 0;

6 a = c;

7 if (n < c)

8 {

9 n = a + b;

10 }

11 return n;

12 }

13

14 int g(int c)

15 {

16 int n = 0;

17 int a = c;

18 if (n < f(c))

19 {

20 n = a + b;

21 }

22 return n;

23 }

24

25 int main()

26 {

27 int i = 1;

28 int b = g(i);

29 cout << a + b + i << endl;

30 return 0;

Answer 1

1 int a = 0; // global variables
2 int b = 0; // global variables
3 int f(int c) // here c is parameter
4 {
5 int n = 0; // c is local variable
6 a = c; // here a is global variable
7 if (n < c)

8 {

9 n = a + b; // a,b are global variable

10 }

11 return n;

12 }

13

14 int g(int c) // here the c is parameter

15 {

16 int n = 0; // here n is local variable

17 int a = c; // here a is local variable

18 if (n < f(c))

19 {

20 n = a + b; // here a is local variable and b is global variable

21 }

22 return n;

23 }

24

25 int main()

26 {

27 int i = 1; // here i is local variable

28 int b = g(i); // here b is local variable

29 cout << a + b + i << endl; // a,b is global variable

30 return 0;