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CS 010: Introduction to Computer Science I

Quiz 5: 10 minutes

1. What is output by the following program?

#include <iostream>

using namespace std;

void do_something(int& x)

{

x = x * 2;

}

int main()

{

int a = 1;

while (a < 10)

{

cout << a << “ “;

do_something(a);

}

return 0;

}

a. 1 2 3 4 5 6 7 8 9

b. 1 2 4 8

c. 8

d. 16

e. Infinite loop, program never ends

f. Program will not compile

2. Which is the BEST choice for a header for the following function?

??????

{

int product = 1;

for (int i = 1; i < n; i++)

{

product = product * i;

}

return product;

}

a. void factorial()

b. int factorial()

c. int factorial(int& n)

d. int factorial(int n)

3. Which is the BEST choice for a header for the following function?

??????

{

a = n;

b = n * n;

return;

}

a. void do_something()

b. void do_something(int a, int b, int n)

c. void do_something(int& a, int& b, int& n)

d. int do_something(int& a, int& b, int& n)

e. void do_something(int& a, int& b, int n)

f. int do_something(int a, int b, int& n)

Use the following function prototypes (declarations) for the next 2 questions.

void func1(int n, double m, string s);

int func2(int& n);

bool func3(int n);

4. Which statement has an error given n1 is an integer variable, d1 is a double variable, and s1 is a string variable?

a. func1(10, 20.0, “abc”);

b. func1(func2(n1), d1, s1);

c. if (func3(n1)) cout << s1;

d. n1 = func2(n1);

e. cout << func2(func1(n1, d1, s1));

f. B and E

5. Which statement does NOT have an error given n1 is an integer variable, d1 is a double variable, and s1 is a string variable?

1. n1 = func1(10, 20.0, “abc”);
2. cout << func2(10)
3. s1 = func3(10);
4. while (func2(n1) < 100) func1(n1, d1, s1);
5. bool b1 = func3(10);
6. D and E

6. A function may be defined within another function.

1. TRUE
2. FALSE

7. Which expression is equivalent to the following expression?

!(m < n && o == p)

1. !(m < n) || !(o == p)
2. m >= n && o != p
3. m >= n || o != p
4. A and C

8. Which expression is equivalent to the following expression?

m > n || !(o <= p && q > r)

1. m <= n && o > p || q < r
2. !(m <= n && o <= p && q > r)
3. m > n || o > p || q <= r
4. m > n || o > p && q <= r
5. A and B
6. B and C

9. What is output by the following code fragment?

int i;

for (i = 0; i < 5; i = i + 2)

{

cout << i << “ “;

}

cout << i << endl;

1. 0 1 2 3 4 5
2. 1 2 3 4 5
3. 0 2 4 6
4. 0 2 4
5. 2 4 6 8
6. this is an infinite loop

10. Which for loop would produce the output: 5 4 3 2 1

1. for (int i = 5; i > 1; i--) cout << i << “ “;
2. for (int i = 1; i < 5; i--) cout << i << “ “;
3. for (int i = 5; i > 0; i--) cout << i << “ “;
4. for (int i = 0; i < 5; i--) cout << i << “ “;