1. CS 240 Computer Programming 1
Variables

2. Write the following algebraic expressions as C++ expressions:
Question 1:
Write the following algebraic expressions as C++ expressions:
b* b – 4*a*c

3. (y*(x*x-y*y)) / (x*x+3*x*y)
Question 1:
Write the following algebraic expressions as C++ expressions:
(y*(x*x-y*y)) / (x*x+3*x*y)

4. Question 2-a:
Each of the following assignment statement contains at least one error. Identify them:
Delta=x(y+(3x+(z+15)))
X=5=y+4

5. Correct the following program so that the output will be 5 .
Question 2-b:
Correct the following program so that the output will be 5 .
* include <iostream>
using namespace std;
\\function main begins program execution
int main() [
int a=5;b=5;c=1;d==1;
result = a+b/c+d;
cout << "The Result is " << result << endl; // print result; end line }

6. Question 2-b: Answer #include <iostream> using namespace std;
//function main begins program execution
int main() {
int a=5;
int b=5;
int c=1;
int d=1;
int result;
result = (a+b)/(c+d);
cout << "The Result is " << result << endl; // print result; end line
return 0; }

7. Question 3: d/= y %z + x; Type:int value:1
For the each of the following expressions, give the type and value of its result. Assume the following declarations have
been executed before each expression.
int x = 2; int y = 5; int z = 6 ; int t = 7; int d = 8;
d/= y %z + x;
Type:int value:1

8. Type:bool value:false
Question 3:
For the each of the following expressions, give the type and value of its result. Assume the following declarations have
been executed before each expression.
int x = 2; int y = 5; int z = 6 ; int t = 7; int d = 8; ;
x % t < z / y;
Type:bool value:false

9. Question 3: --t == t-- ; Type:bool value:true
For the each of the following expressions, give the type and value of its result. Assume the following declarations have
been executed before each expression.
int x = 2; int y = 5; int z = 6 ; int t = 7; int d = 8;
--t == t-- ;
Type:bool value:true

10. Question 3: t- = y + z - x/t; Type: int value:-4
For the each of the following expressions, give the type and value of its result. Assume the following declarations have
been executed before each expression.
int x = 2; int y = 5; int z = 6 ; int t = 7; int d = 8;
t- = y + z - x/t;
Type: int value:-4

11. Question 4:
Trace the following code to find the value assigned to each variable. Assume that all variables are properly declared as int.
x = 17; y = 15; x = x + y / 4; z = x % 3 + 4; w = 17 / ; t = x / % ;
X= 20
Y= 15
Z= 6
W= 11
T=4

12. What is the output by each of the following code fragment?
Question 5:
What is the output by each of the following code fragment?
int a=1;
int b=-3;
int c=2;
b=a++;
c+=--a+b++;
cout<<a<<" "<<b<<" " <<c;
The output :

13. What is the output by each of the following code fragment?
Question 5:
What is the output by each of the following code fragment?
#include <iostream>
using namespace std;
int main() {
int a=3;
int result;
result = % 5 * a++ / 4;
cout << "The Result is " << result << endl;
return 0; }
The output :
The Result is :3

14. What is the output by each of the following code fragment?
Question 5:
What is the output by each of the following code fragment?
#include <iostream>
using namespace std;
int main() {
int Cost=5,Price=10;
Cost*=Price+2;
cout << "The Cost is " << Cost<< endl;
cout << "The Price is " << Price<< endl;
return 0; }
The output :
The Cost is 60
The Price is 10

15. Problems

16. Problem 1
Question
Write a program that asks the user to input 2 numbers A and B, then exchange the values of A and B.

17. Problem 1
Answer

18. Problem 1
Answer

19. Problem 2
Question
Write a program that asks the user to type 5 integers and then prints the average of these 5 integers .

20. Problem 2
Answer

21. Problem 2
Answer

22. Problem 3
Question
Write a program that reads in the length and the width of a rectangular yard. Your program should compute the time required (in minutes) to cut the grass at the rate of 2.3 square meters per a second.

23. Problem 3
Answer

24. Problem 3
Answer

25. Problem 4
Question
Write a program that asks the user to type the price without tax of one kilogram of tomatoes, the number of kilograms you want to buy and the tax in percent units. The program must calculate the total price including taxes.

26. Problem 4
Answer

27. Problem 4
Answer

28. Evaluations

29. (One inch equals 2.54 centimeters.)
Question
Write a program that prompts the user to input a length expressed in inches. The program should then convert the length to centimeters.
Hint
(One inch equals 2.54 centimeters.)

30. Answer

31. Problem 5
Answer