Final Exam prep

Question 1

We can use the g++ compiler to read the high level code and store a translation in another file, the executable

True?
False?

Answer 1

True

Question 2

Words in the C++ programming language are case insensitive

True?
False?

Answer 2

False

Question 3

The ______ of a program language are its own precise grammar rules

a: syntax
b: semantics
c: execution
d: compilation

Answer 3

a: syntax

Question 4

The ______ of a program represent the actual meaning of a segment of source code

a: indentation
b: semantics
c: syntax
d: code blocks

Answer 4

b: semantics

Question 5

The assignment operator = allots the value of the right-side expression to the left operand

True?
False?

Answer 5

True

Question 6

What is the final value of the variable b after the program is executed?
#include <cstdio></cstdio>

int main()
{
int a = 4, b = 0;
b = (a * 3) + 2;
printf(“%d”, b);
}

a: 18
b: 14
c: 0
d: 20

Answer 6

b: 14

Question 7

Assume x = 2 and y = 3. What is the output of the following statement?
printf(“x=%d”, y);

a: y = 2
b: x = 2
c: x = 3
d: y = 3

Answer 7

c: x = 3

Question 8

include <cstdio></cstdio>

What is the final value of the variable Pi after running the following program?

int main()
{
int age;
float myNumber;
int y = 3, z = 4;
float x = 0;
const float Pi = 3.1416;
int r = 7;
float area = 0;

Pi = Pi + 4
}

a: 0
b: None of the options listed. The program will not compile
c: 7.1416
d: 3.1416

Answer 8

b: None of the options listed. The program will not compile.

Note: the reason that the program will not compile is that 4 is not recognized by the program.

Note: declaration of a const means you cannot manipulate it

Question 9

What is the output of the following program?
#include <cstdio></cstdio>

int main()
{
int a = , b = 3;
//b = a + 1;
//b = a * a;
b = b + a;
b = b * b;
//b = b + 2;
printf(“%d”, b);
}

a: 11
b: 0
c: 9
d: 3
Following up question: what is the purpose of %d?

Answer 9

b: 9

Answer for the following up question:
%d
prints the value of the int variable num in decimal number system
%o
prints the value of the int variable num in octal number system

Question 10

#include <cstdio></cstdio>

int main()
{
//printf(“hello world!”);
//printf(“this is a second line”);
printf”this is the a third line”);
//printf(“Programming is fun!”);
}

a: hello world!
b: this is a third line
c: Programming is fun!
d: this is a second line

Answer 10

b: this is a third line

Question 11

To use a funcion effectively, we only need to know:
_ its name
_ the type of data value (if any) it returns

True?
False?

Answer 11

False

Question 12

return( printf(“%d”, ‘t’));

a: void
b: int
c: char
d: none of the options is correct

Answer 12

b: int

Question 13

What would be the value assigned to x?
int x = increaseMe(increaseMe(increaseMe(3)))%7?
————————–
int increaseMe(int x)
{
int y = x + 1;
return(y);
}

a: 0
b: 1
c: 6
d: 7

Answer 13

c: 6

Question 14

Functions are requied to have parameters.

True?
False?

Answer 14

False

Question 15

What would be the value assigned to v?
int v = increaseMe(multiplyUs(6,5));
————————
int increaseMe(int x)
{
int y = x + 1;
return(y);
}

int multiplyUs(int n1, int n2)
{
return(n1/n2);
}

a: 31
b: 2
c: 1
d: 0

Answer 15

b: 2

Question 16

printf(“%d”, ‘t’);

a: none of the options is correct
b: a floating point number
c: a number
d: char

Answer 16

c: a number

Question 17

float multiplyUs(float n1, float n2)
{
float result = n1 / n2;
return(‘m’);
}

void printSomethin(int number)
{
cout &laquo_space;increaseMe(number) &laquo_space;endl;
}

True?
False?

Answer 17

False

Question 18

printf returns a count of how many characters it displayed

True?
False?

Answer 18

True

Question 19

When a return statement runs, the function immediately ends and sends back the return value

True?
False?

Answer 19

True

Question 20

scanf returns a count of how many characters were assigned to a variable

True?
False

Answer 20

False

Question 21

a: if(age > 10 || userDept == 7 && userDept == 13){}

b: if(age > 10 || (userDept == 7 && userDept == 13)){}

c:if(age > 10 && userDept == 7 && userDept == 13){}

d:if(age > 10 && (userDept == 7 || userDept == 13)){}

Answer 21

d:if(age > 10 && (userDept == 7 || userDept == 13)){}

Question 22

int main()
{
int a = 1;
switch(a)
{
case 1:
cout«“One”;
case 2:
cout«“Two”;
case 3:
cout«“Three”;
default:
cout«“Default”;
}
}

a: Three
b: Default
c: One
d: None of the options listed
d: Two

Answer 22

d: None of the options listed

Question 23

a flag is a Boolean variable signaling that some condition exists in the program. When the flag is set to false it indicates the condition does not exist. When the flag is set to true it indicates that the condition does exist.

True?
False?

Answer 23

True

Question 24

int main()
{
if(5 == -1)
{
cout«“M”;
}
else
{
cout«“T”;
}
}

a: M
b: The code will not compile
c: None of the options listed
d: T

Answer 24

d: T

Question 25

Which logical C expression correctly determines whether x and y are greater than z?

a: (x && y > z)
b: (x > z) && (y > z)
c: (x < z) & (y < z)
d: (x > y > z)
e: none of the options listed

Answer 25

remember:
a: logically wrong

correct answer: b

Question 26

bool something(bool n)
{
if(n)
{
return(false);
}
return(something(true || n));
}

a: none of the options listed
b: true
c: false
d: the function definition is incorrect

Answer 26

c: false

Question 27

A trailing else provides code that is executed when none of the conditions in the if/else if statements are true

True?
False?

Answer 27

True

Question 28

The preferred parameter passing mechanism is called pass-by-value: It evaluates the value being passed, and copies that value to the function’s parameter

True?
False?

Answer 28

True

Question 29

Global variables should generally be avoided: they complicate maintenance and debugging, since any function in the program could be manipulating them.

True?
False

Answer 29

True

Question 30

Which of the following statements is false:

a: it is possible for multiple functions o have a local variable with the same name, but they’re all separate.
b: local variables can be accessed by other functions
c: local variables are visible within the function they are declared.
d: local variables are declared within a function

Answer 30

b: local variables can be accessed by other functions

Question 31

Like variables, the contents of an array could be any values until/unless we specifically store something. The first time we store a value in an array position we are initializing that array element

True?
False?

Answer 31

True

Question 32

The update statement is performed at the bottom of a for loop, just after each pass through the body

True?
False?

Answer 32

True

Question 33

for (int i = 1; i <= 10; i = i + 2)
{
cout«i;
}

a: 13579
b: 1357
c: 1234568910
d: 1358

Answer 33

a: 13579

Question 34

What loops need a semi colon after?

a: do
b: while
c: all of the options listed
d: for

Answer 34

a: do

Question 35

What is the output of the following program:

int main()
{
int myArray[4] = {77, 33, 44, 8};

    for(int i=0; i < 4; ++i)
    {
            cout << myArray[i];
    } }

a: 7348
b: None of the options listed
c: 8443377
d: 7733448

Answer 35

d: 7733448

Question 36

In nested loops, the outer loop runs to completion first (likely multiple times) before the inner loop is executed

True?
False?

Answer 36

False

Question 37

For an array of size N, the positions are numbered 0…N.

True?
False?

Answer 37

False

reason: 0 to N-1

Question 38

The following code will produce an infinite loop:

int main()
{
int i = 10;
while(i<100)
{
cout &laquo_space;i &laquo_space;endl;
}
}

True?
False?

Answer 38

True

Question 39

What loops are guaranteed to execute at least once?

a: while
b: none of the options listed
c: d
d: for

Answer 39

c: do

Question 40

An array is organized into positions, each acting as a storage spot for one item

True?
False?

Answer 40

True

Question 41

When we define a struct we are actually defining a new data type: a structure made up of a variety of components, or fields, each given heir own name

True?
False?

Answer 41

True

Question 42

When passing arrays as parameters to functions, the function can by default change the content of the array.

True?
False?

Answer 42

True

Question 43

When functions include optional parameters, you must also consider the ambiguity of possible combinations of passed parameters.

T or F

Answer 43

True

Question 44

In terms of order of parameter assignment, the parameters passed by the caller are assigned to the formal parameters in right-to-left order. Then any remaining parameters use their default values.

T or F

Answer 44

False

Question 45

include <iostream></iostream>

What is the output of the following program:

using namespace std;

void swap(float &x, float &y);

int main()
{

    const int Size = 5;
    float one[Size] = {1, 3, 5, 7, 9};

    swap(one[0],one[Size-1]);
    swap(one[0],one[2]);

    for(int i=0; i < Size; ++i)
    {
            cout << one[i];
    }

}

void swap(float &x, float &y)
{
float temp = x;
x = y;
y = temp;
}

a: 53971
b: 53179
c: 13579
d: 97531
e: None of the options listed

Answer 45

a: 53971

Question 46

include <iostream></iostream>

What is the output of the following program:

using namespace std;

struct something
{
int x, y;
};

int main()
{
something a, b, c;
a.x = 1;
a.y = 3;
b.x = ++a.x;
c.y = 9;
cout &laquo_space;c.y - b.x;
}

a: 9
b: 0
c: 1
d: none of the options listed
e: 7

Answer 46

e: 7

Question 47

Binary search is more efficient than linear search

T or F

Answer 47

True

Question 48

Structs allow us to group elements of a specific data type into a single logical entity, then refer to them by position.

T or F

Answer 48

False

Question 49

include <iostream></iostream>

What is the output of the following program:

using namespace std;

int foo(int arr[], int size);

int main()
{

    int goo[5] = {9,7,5,3,1};
    cout << foo(goo,5);

}

int foo(int arr[], int size)
{
int total = 0;
for (int p=0; p<size; p=p+2)
{
total = total + arr[p];
}
return(total);
}

a: 25
b: None of the options listed
c: 0
d: 15
e: 9

Answer 49

d: 9

Question 50

Binary search works on a sorted or unsorted array

T or F

Answer 50

False

Question 51

When we define a struct we are actually defining a new data type: a structure made up of a variety of components, or fields, each given their own name.

T or F

Answer 51

True

Question 52

Extra syntax can be added to the definition of a parameter to allow a function to alter its actual value. What is that syntax?

a: none of the options listed
b: &
c: %
d: =

Answer 52

b: &

Question 53

The update statement is performed at the bottom of a for loop, just after
each pass through the body.

T or F

Answer 53

True

Question 54

What is the output of the following program:

int main()
{
int myArray[4] = {77, 33, 44, 8};

    for(int i=3; i >=0 4; --i)
    {
            cout << i;
    } }

a: 8443377
b: 0123
c: 3210
d: 7733448

Answer 54

a: 8443377

Question 55

What value will be returned from evaluating something(4)?

int something(int n)
{
if(n==0)
{
return(0);
}
return(n * something(n-1));
}

a: 4
b: 24
c: 12
d: 0

Answer 55

d: 0

Question 56

We can use & to look up the memory address of constants, variables, and parameters.

T or F

Answer 56

True

Question 57

We can use a pointer to access the contents of an address in memory. This is is called dereferencing.

T or F

Answer 57

True

Question 58

include <iostream></iostream>

What is the output of the following program:

using namespace std;

int main()
{
int *x, *y, X;
x = &X;
y = x;
*x = 7;
*y = 13;
cout &laquo_space;X;
}

a: 7
b: 0
c: none of the options listed
d: 13

Answer 58

d: 13

Question 59

We declare pointer variables by adding & to the data type

T or F

Answer 59

False

Question 60

include <iostream></iostream>

What is the output of the following program:

using namespace std;

int main()
{
const int size =2;
int *p1, *p2;
int arr[size];

    p1 = &arr[0];
    p2 = arr;
    if( p1 == p2)
    {
      cout << 1;
    }
    cout << 7;  }

a: 7
b: none of the options listed
c: 1
d: 17

Answer 60

d: 17