CS 115 - Lab 3 -Using Relational and Logical Operators to Evaluate Logical (Boolean) Expressions: Ne

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Lab 3

Using Relational and Logical Operators to Evaluate Logical (Boolean) Expressions Evaluate the logical (Boolean) expression in the Expression column, and circle all possible answers in the Result column. For char and string types, use the ASCII collating sequence.

Expression

Result

1. int num1 = 3, num2 = 2;

(Circle all possible answers) True

(num1 > num2) double hours = 12.8;

False

2.

(hours > 40.2)

3. int funny = 7;

True

4.

(funny !=1) char letter = ‘A’;

False

5.

then 'a' < letter short count = 1;

True

count <=4;

6. double y = -2.3;

True

y >=0.0;

C++ Lab Manual 2e Page 4-1

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Expression

Result

1.

2.

3.

4.

! (false || false) || true false && true && false ! false || (false || ! true) false || (true && (false ||

True False True False

5.

6.

7.

8.

9.

false) ) 1 || ! true && false ! (false || false) || false true && false && false ! false || (false || ! true) false || (false && (false ||

True True False True False

10.

true) ) 0 || ! false &&

False

false

Expression

Result

1. string name1 = “Aaron”;

False

string name2 = “aaron”; (name1 == name2)

2. string name1 = “Aaron”;

False

string name2 = “Aardvark”; (name1 <= name2)

3. bool flag = true;

True

int a = 2, b = 5, c = 10; (a * b <= c && ! flag)

4. char letter = ‘A’;

Error

string word = “A”; (letter == word)

C++ Lab Manual 2e Page 4-2

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Using Nested if and if…else Statements 1a. Write what the following statements display as output after the program executes. int temperature = 78; int month = 6; string name = “Pat Boone”; if ( temperature >= 70 && month >=6) cout << “Wear white shoes.\n”; else if (name == “Pat Boone”) cout << “Wear white shoes.\n”; else cout << “Wear black shoes.\n”; Wear white shoes 1b. What is the output of the program in Exercise 1a when temperature = 70, month = 5, and name = “Pat Boone”?

Wear white shoes 1c. What is the output of the program in Exercise 1a when temperature = 60, month = 5, and name = “Pat Boone”? Wear white shoes 1d. What is the output of the program in Exercise 1a when temperature = 60, month = 5, and name = “Your name”? Wear black shoes 2b. Write a C++ program based on the design you created in Exercise 2a and name it NameSort.cpp.

Step through the code by hand.

1. // Enter your name as a comment for program identification C++ Lab Manual 2e Page 4-3

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2. // Program assignment NameSort.cpp 3. // Enter your class section, and time 4. // 5. /* The program NameSort.cpp is a program that prompts the user to enter three 6. names separated by blanks. The names are displayed in alphabetical order. */ 7. /* The user will input three names separated by blanks. */ 8. /* The names will be displayed in alphabetical order. */ 9. //header files 10. // use the correct preprocessor directives for input/output and strings 11. ------------------------12. --------------------------13. -----------------------14. int main() 15. { 16. // declare variables 17. /* declare 3 string variables to read in the three names */ 18. --------------------------------------------19. // 20. // prompt the user for three names 21. --------------------------------------------22. // read in the three names 23. ----------------------------------------------24. // 25. // display a message describing the output 26. -----------------------------------------------------------------------27. // 28. /* test to see if name1 is less than or equals to name2 and name1 is less than or equal to name3 29. if true, 30. display name1 31. test to see if name2 if less than name3 32. if true, 33. display name2 and name3 34. else if false, 35. display name3 and name2 36. else if false, 37. test to see if name2 is less than or equals to name3 and name2 is less than or equal to name3 38. if true, 39. display name2 40. test to see if name1 is less than or equals to name3 41. if true, 42. display name1 and name3 43. else if false 44. display name3 and name1

C++ Lab Manual 2e Page 4-4

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45.

46.

47.

48.

49.

50.

51.

else if false display name3 test to see if name1 is less than or equal to name2 if true, display name1 and name2 else if false display name2 and name1

#include<iostream> #include<string> using namespace std; int main(){ /* declare 3 string variables to read in the three names */ string name1,name2,name3; // prompt the user for three names cout<<"Enter Three Names :"; // read in the three names cin>>name1>>name2>>name3; //sorting by name if(name1>name2)std::swap(name1,name2); if(name2>name3)std::swap(name2,name3); if(name1>name2)std::swap(name1,name2); // display a message cout<<"Names in Alphabetical Order \n"; cout<<name1<<" "<<name2<<" "<<name3<<endl; return 0; }

Use the following memory table to show what occurs in memory when the C++ code is executed.

(Include line numbers as documentation only. Do not use line numbers when entering your final program.) To fill out the memory table, use two lines for each variable. On one line, enter declaration information. Write the name of the declared variable, its data type, and the line number at declaration.

Variable name

Data type

Value in memory

Line number at declaration

Line number when initialized

Sandwich

string

Ham

17

24

C++ Lab Manual 2e Page 4-5

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2c. Enter, compile, link, and execute NameSort.cpp.

Following is a copy of the screen results that might appear after running your program, depending on the data entered. The input entered by the user is shown in bold.

Please enter 3 names: George Joe Adam

The alphabetical order of the names is: Adam George Joe

2d.

Rerun NameSort.cpp with the names entered in this order: Joe Adam George Please enter 3 names: Joe Adam George The alphabetical order of the names is:

2e.

Rerun NameSort.cpp with the names entered in this order: Adam Joe George Please enter 3 names: Adam Joe George The alphabetical order of the names is:

2f.

Rerun NameSort.cpp with the names entered in this order: George Adam Joe Please enter 3 names: George Adam Joe The alphabetical order of the names is:

C++ Lab Manual 2e Page 4-6

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