Using cin, Allocating Memory, and Writing Assignment Statements cin, Memory Allo

Question

Using cin, Allocating Memory, and Writing Assignment Statements cin, Memory Allocation, and Assignment Statements Show the variable name and value of each statement

1. int a, b = 9; a = b;

2. int d = 2, x = 3, y = 1; y + 4 = d - x;

3. short number = 10; number = 0;

4. short number = 0; number = 10; number = number + 5;

5. double value = 12.0; value = 10.0; value = value + .5;

6. const int b = 9;

7. double x = -14.5, y = 22.5; int d = 3; y = d - x + y;

8. double ans = 4;

9. int n; cin >> n; //Assume the user enters 3.24.

10. char a; cin >> a;

Assume the user enters 'b'

11. double x; cin >> x;

//Assume the user enters 3.24.

12. double a, b, c = 0.0;

13. int d = 2, x = 3, y = 4; 4 = d - x + y;

14. double def = 123.5; int y;

y = def;

15. int b = 9.0;

16. int num1= 8, num2 = 3, temp = 0;

temp = num1; num1 = num2; num2 = temp;

17. int num; cin >> num;

//Assume the user enters 8. num++;

18. int c = 8; ++c;

c--;
19. double x = 5.0;

int y = 4;

x = x + y / 4;

20. double x = 5.0;

int y = 4;

y = x + y/4;

21. int count = 0;

cout << ++count << endl;

cout << count++ << endl;

cout << count << endl;

Explanation / Answer

1. int a, b = 9, a = b; values: a = b = 9

2. int d = 2, x = 3, y = 1; y + 4 = d - x; values: d = 2, x = 3, y = 1, but y + 4 = d - x gives compilation error varible value required

3. short number = 10; number = 0; values: number = 0, first statement sets number to 10 but second sets it to 0

4. short number = 0; number = 10; number = number + 5; values : number = 15

5. double value = 12.0; value = 10.0; value = value + .5;   values: value = 10.500000

6. const int b = 9;  values: b = 9, b can't be modified as const keyword is used

7. double x = -14.5, y = 22.5; int d = 3; y = d - x + y; values: x = -14.5, d = 3, y = 40.000000

8. double ans = 4; values: ans = 4.000000

9. int n; cin >> n; //Assume the user enters 3.24. values: n = 3

10. char a; cin >> a; values: a = 'b'

Assume the user enters 'b'

11. double x; cin >> x; values: x = 3.240000

//Assume the user enters 3.24.

12. double a, b, c = 0.0; values: a, b have garbage values, c = 0.000000

13. int d = 2, x = 3, y = 4; 4 = d - x + y; values: compilation error 4 = d - x + y, variable value required on left side of assignment

14. double def = 123.5; int y; y = def; values: def = 123.500000, y = 123

15. int b = 9.0; values: b = 9

16. int num1= 8, num2 = 3, temp = 0;

temp = num1; num1 = num2; num2 = temp; values: this is swaping of numbers so, num1 = 3, num2 = 8, temp = 8

17. int num; cin >> num;

//Assume the user enters 8. num++; values: num = 9, after inputing 8 value of n is incremented by 1

18. int c = 8; ++c; c--; values: c = 8, as first c is incremented and then decremented leads to original value

19. double x = 5.0;

int y = 4;

x = x + y / 4; values: y = 4, x = 5.0 + 4 / 4 = 6.000000

20. double x = 5.0;

int y = 4;

y = x + y/4; values: x = 5.000000, y = 6

21. int count = 0;

cout << ++count << endl; output: 1, count = 1, count is preincremented

cout << count++ << endl;   output: 1, count = 2, count is postincremented

cout << count << endl;   output: 2, count = 2

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