CSCI 152 Quiz 1 ( 25 Jan ) Name _______________________

Spring 2005

1. Circle the best answer:

a) if (8 < 2*3)

cout << “Hello”;

cout << “ There”;

Outputs the following:

(i) Hello There (ii) Hello (iii) There (iv) none of these

b) if (7 <= 7)

cout << 6-9*2/6;

Outputs the following:

(i) -1 (ii) 3 (iii) 3.0 (iv) none of these

c) if (5 < 3)

cout << “*”;

else

if (7 == 8)

cout <<”&”;

else

cout << “$”;

Outputs the following:

(i) * (ii) & (iii) $ (iv) none of these

2. Write C++ statements that accomplish the following:

a) Declares int variables x and y.

int x; int x, y;

int y;

b) Initializes an int variable x to 10 and a char variable ch to ‘B’.

x = 10;

ch = ‘B’;

c) Updates the value of an int variable x by adding 5 to it.

x = x + 5; x += 5;

d) Sets the value of a double variable z to 25.3;

z = 25.3;

e) Copies the content of an int variable y into an int variable z.

z = y;

f) Swaps the contents of the int variables x and y. (Declare additional variables, if necessary).

int tmp;

tmp = y;

y = x;

x = tmp;

3. a) Convert the following for loop into an equivalent while loop:

for (int i=3; i<=6; i++)

{

cout << i*i << “ “;

}

cout << endl;

int i=3;

while (i <= 6)

{

cout << i*i << “ “;

i++;

}

b) What is the output of the loop.

9 16 25 36

4. a) Write a value-returning function, isVowel, that returns the bool value true if a character that is given as the functions parameter is a vowel (you need only check for the lower case vowels a, e, i, o, u or y) and otherwise returns false.

bool isVowel(char c)

{

if ((c == ‘a’) || (c == ‘e’) || (c == ‘i’) || (c == ‘o’) || ( c == ‘u’))

return true;

else

return false ;

}

b) Declare a character variable named ch. Ask a user to input a character value and read one in from standard input into the ch variables you declared.

char ch;

cout << “Enter a character: “;

cin >> ch;

c) Use your isVowel function to print out “You entered a vowel” if the ch that the user entered in (b) was a vowel, otherwise print out “You entered a consonant”.

if (isVowel(ch))

cout << “You entered a vowel” << endl;

else

cout << “You entered a consonant” << endl;