Given the variable declarations, evaluate the following compound conditions. Indicate with YES or NO next to each of the six numbers whether that simple condition will be evaluated.

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

 Problem Solving and Programming

 

1) [4 points] Given the variable declarations, evaluate the following compound conditions.  Indicate with YES or NO next to each of the six numbers whether that simple condition will be evaluated.  Also, indicate the value of the compound condition.

 

int d = 7;

int e = 2;

 

1.  a) d != 5 || d != 6 || d != 7 || d != 8 || d != 9 || d != 10

                   1          2          3          4           5          6

Simple conditions ®                       

 

                   1)

 

                   2)

 

                   3)

 

                   4)

 

                   5)

 

                   6)

 

                   Compound condition value: __________

 

1. b) e != 5 && e != 4 && e != 3 && e != 2 && e != 1 && e != 0

             1               2               3              4               5              6

 

Simple conditions ®  

                   1)

 

                   2)

 

                   3)

 

                   4)

 

                   5)

 

                   6)

 

                   Compound condition value: __________

 

2) [3 points] The most common logical operators are AND, OR, and NOT, but there are other ones.  Research and complete truth tables for the following operators:

 

1. a) Exclusive or (XOR)

 

“xor” operator truth table
Left side	Right side	Result

 

1. b) Implication (®)

 

“implication” operator truth table
Left side	Right side	Result

 

1. c) Biconditional («)

 

“biconditional” operator truth table
Left side	Right side	Result

 

3) [6 points] Prompt for and read a single upper-case element symbol into char variable sym.  Print the corresponding element and atomic number.  Print an error message if any other character is entered.  Write both if statement and switch statement versions.

 

Element	Symbol	Atomic number
Boron	B	5
Carbon	C	6
Nitrogen	N	7
Oxygen	O	8

 

1. a) if statement version

 

 

 

 

1. b) switch statement version

 

 

 

 

4) [4 points] Write a validation loop that prompts for and gets from the user a string that is at least five characters in length.  If the string is outside that length range, print a message including the string and prompt the user again.  Declare string variable str to hold the string.  Allow the user to enter spaces.

 

 

 

 

5) [7 points] Write the number of for statement loops that will be performed for each of the following:

 

	Initialization	Condition	Update	Loops?
a)	i = -4	i <= 4	i = i + 1
b)	i = 20	i < 30	i = i + 4
c)	i = 7	i <= 7	i = i – 1
d)	i = 15	i > 16	i = i * 2
e)	i = 0	i < 50	i = i – 3
f)	i = 24	i > 12	i = i – 2
g)	i = 17	i != 8	i = i – 2

 

6) [1 point] Why should the continue statement rarely be used?

 

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