Comp Sci
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/*
What signals to the compiler to ignore what comes after it on the rest of that line only?
//
What is in x at the end of this code? int x = 10; int y = 20; int z = 30; x = y = z = 0;
0
What is the index value of the first element in an array?
0
How many times will the word "HELLO" be printed to the screen in the code below? int main() { bool RUN = false; do { cout << "HELLO"; } while (RUN); }
1
What will be the value of A in the code below? int main() { double A; A = 9 / 5; }
1
What will be the value of A in the code below? int main() { int A; A = (7.0 * 3.0) / 2.0; }
10
What will the output from the following code be? int myarray[5], i, sum; for (i=0; i<5; i++){ myarray[i]=i; } for (i=0; i<5; i++){ sum+= myarray[i]; } cout<<sum;
10
What is the output of the following code fragment? int y = 30; int main() { y = 10; mystery(); cout << y << endl; } void mystery() { int y; y = 100; cout << y << ","; }
100,10
What is the value of the following expression? 7 * 3 + 8 - 9 * 2
11
Using the following statement what is output from the following cout<<setprecision(3)<<1234.56789<<" "<<98.87432<<endl;
1234.568 98.874
How many times will "OUT" be printed to the screen with the code below? int main() { int i = 0; int VALS = 130; while (i < VALS) { cout << "OUT"; i++; } }
130
What is printed to the screen in the code below? int getValue(int d) { d = 55; return d; } int main() { int data = 15; getValue(data); cout << data; }
15
What is the output of the following function call? //function body int mystery(int n) { int sum = 0, i; for (i = n; i < 10; i+= 2) { sum = sum + i; } return sum; } //function call cout << mystery(4);
18
Suppose the array grades has the following values: 0 17 1 55 2 14 3 38 4 83 5 16 6 29 What is the output of the following code? x = 0; for (i = 0; i < 7; i++) { if (grades[i] > 50) x += 1; } cout << x;
2
What will be the value of A in the code below? int main() { int A = 7; int B = 5; A = A % B; }
2
void func(int a) { a = 777; } int main() { int a = 222; func(a); cout << a; }
222
Assuming the executable file is called "./Lab1", what would be output to the screen below given the following command line? ./Lab1 Hello World int main(int argc, char *argv[]) { cout << argc << " " << argv[0] << endl; }
3 ./Lab1
What does the following expression evaluate to? 2 + 7 * 8 / 2
30
What is printed to the console with the following code? int myarray[] = {1, 2, 3, 4, 5, 6}; cout << myarray[3] << endl;
4
What is output to the console in the code below? struct MyStruct { int a; }; int main() { MyStruct s; int a = 55; s.a = 77; cout << a << endl; }
55
What is output to the screen with the code below? void myfunc(int &a) { a = 55; } int main() { int a = 77; myfunc(a); cout << a; }
55
What will the output from the following code be? int myarray[4], i, sum=0; for (i=0; i<4; i++){ myarray[i]=i; } for (i=0; i<4; i++){ sum+= myarray[i]; } cout<<sum;
6
int main(){ int i = 7; int j = 13; int k = 15; ofstream fout; fout.open("myfile"); fout << i << " " << j << " " << k; fout.close(); } What will the file "myfile" contain after this program runs?`
7 13 15
Assume the user inputs the following to the program: 7 9 8 What would be the value of C in the code below? int main() { int A, B, C; cin >> A >> B >> C; }
8
How many bits are in a byte?
8
What is printed to the screen with the following code? int getValue(int j, int k) { return j % k; } int main() { cout << getValue(30, 11); }
8
The following expression A *= 7; Is short hand for which expression?
A= A*7
Given the following input, what will be printed to the console? Hello My Darling Hello My Pal const int MAX_STRINGS = 6; string myarray[MAX_STRINGS]; for (int i = 0;i < MAX_STRINGS;i++) { cin >> myarray[i]; } cout << myarray[2];
Darling
cout stands for "Console Output" which means
Data FROM the computer (memory) TO the user (monitor)
cin stands for "Console In" which means
Data FROM the user (keyboard) TO the computer (memory)
Examine the following code: int main() { ofstream fout; fout.open("myfile.txt"); return 0; } Where is the file "myfile.txt" located after this program runs?
Either in the current working directory (e.g. the debug folder for code lite) or it doesnt exist because it wasnt closed
Under what conditions will the following code output "Unable to open output file" to the console? int main() { ofstream fout; fout.open("myfile.txt"); if (fout.fail()) { cout << "Unable to open output file" << endl; } }
If the file "myfile.txt" is empty.
Given the following file "myfile": John Jason Pi Radians Lo Behold Kuy Lza What will be printed to the console in the following code? int main() { ifstream fin; string line; fin.open("myfile"); getline(fin, line); cout << line; }
John Jasons
Given the following code: class Johnny { int z; public: void setZ(int _z); }; How would I declare a new instance of the "Johnny" class and name it john?
Johnny john;
Which of the following best demonstrates how to declare an instance of a class called MyClass using the zero argument constructor?
MyClass c;
53 Which of the following choices best demonstrates how to define a zero argument constructor?
MyClass::MyClass(){ }
Question 44 0 pts Will the following code compile successfully? class MyClass { int someVariable; public: int getVariable() const; }; int main() { MyClass m; m.someVariable = 55; return 0; }
NO
What does the following code print to the console? int myarray[3] = {1, 2, 3}; cout << myarray[3] << endl;
Nothing program will crash
What does ofstream mean?
Output File Stream
Given the following class: class MyClass { public: MyClass(); MyClass(int, string); }; What is the function MyClass() called?
The zero argument constructor
Given the following code, what be printed to the screen? class MyClass { public: int m_rabid; MyClass(int _is_rabid) { m_rabid = _is_rabid; } }; int main() { MyClass m; cout << m.m_rabid << endl; }
This code will not compile since the C++ provided constructor is no longer provided when the programmer specifies a constructor
The programmer tells the computer how to interpret the bytes in RAM.
True or False
In the following statement where does the result value get stored? a=b+c;
a
What is the data type of argv[1] given below assuming the following command line: ./Lab1 11 22 33 int main(int argc, char *argv[]) { cout << argv[1]; }
a c-style string??
The output from a linked program is
an .exe file (executable code) or source code
In the following code, what is the purpose of argc? int main(int argc, char *argv[]) { }
argc is used to tell the operating system that the user is using command line arguments
What type of values may be returned by the following function? char getValue(int min, string max, double avg);
char
If a memory location had the following bits what might they represent - select all possible correct answers. 11001001
char whole number
What member function of ofstream writes the data to the actual file?
close()
Every program begins with
compiler directives (#include)
A for loop contains four parts: Initializer, Condition, Step (or Update), and Loop Body. Given the following for loop: for (A; B; C) { D } What is the part, identified by B, known as?
condition
Which of the following contain escape sequences?
cout<<"hello\n"; cout<<"hello\t good bye";
If you enter more data values than needed the extra values
create problems for the next program
What data type is returned by the function prototype below? double func(int a);
double
Which of the following statements declares an array named friends that has 40 double elements?
double friends[40];
If you need a function to compute the average of two doubles and return a double, which of the following function prototypes should be used?
double getAverage(double number1, double number2);
The output from a compiler is an executable program
false
When using an IO manipulator, if you use the setw command it will persist until a new setw is used.
false
When you input values prompts are automatically displayed telling the user what to enter.
false
Will the following code compile? cin>>"my input">>myinput;
false
Will the following code compile? cin>>myvar>>endl;
false
Will the following code compile? cout>>"my output">>endl;
false
cout causes results values to be printed to a printer
false
if you have two strings a and b and concatenate them, the results will be that b will replace a
false
Convert the following while loop into a for loop: int i = 1; while (i < 10) { cout << i << endl; i *= 3; }
for (int i = 1;i <10;i *= 3) { cout << i << endl; }
The following code is called a/an? int MyFunction(int, double);
function prototype
Given the following code, what will be printed to the console? int sum; int myarray[] = {1, 2, 3, 4, 5}; for (int i = 0;i < 5;i++) { sum += myarray[i]; } cout << sum;
garbage
Given the following declarations, which of the following statements is not a valid function call (i.e., the compiler will flag it as an error)? string getLabel(int temperature); string label;
getLabel(5) = label;
What task is accomplished by the following code? x = 0; for (i = 0; i < 9; i++) { if (weights[i] < weights[i+1]) x++; } cout << x;
it prints a count of the number of elements in grades that are less than their adjacent, right hand neighbor
Given the following code: class { int a, b; public: void setA(int a); }; setA is called what?
member function
If there are n elements in an array what is the subscript of the last element in the array?
n-1
Is the following member function an accessor? class MyClass { public: int getValue(); };
no
Will an ifstream create a file that doesn't already exist when it is opened?
no
Will the following code compile? int main() { const int A = 77; cout << "Enter a value: "; cin >> A; return 0; }
no
Will the following code compile? int myarray[]; for (int i = 0;i < 3;i++) { cin >> myarray[i]; } cout << myarray[0];
no
Suppose I have the following declaratiion: bool photo[100][100]; How can I assign the value false to row 56, column 81?
photo[55][80] = false;
In the following what tells the program to stop executing and go back to the OS. int main() { // program instructions return 0; }
return 0;
A constructor is automatically called when an object is declared.
right
An output file stream will automatically create or overwrite a file when opened.
right
If the user doesn't specify private or public inside of their class, the member variables and member functions are by default private.
right
The input to the compiler is
source code
string getSomething(int a, char b, double c); What data type can be returned by this function?
string
Suppose I have the following array named scores: 86 73 [42] 51 68 [72] 91 49 Which of the following statements will add the two elements highlighted in yellow and assign them to the variable named sum?
sum = scores[2] + scores[5];
Input data comes in as a stream delimited by
tabs
What will the output from the following code be? int myarray[3], i; for (i=0; i<=3; i++){ myarray[i]=i; } cout<<myarray[1];
the program crashes because the index is out of bounds
Each location in RAM has its own address
true
The difference between a class and a struct is that a class' members are by default private and a struct's members are by default public.
true
The mod operator gives the remainder from a division.
true
The purpose of comments is to explain what the program is doing -- not what individual instructions do.
true
The user gives command to the operating system to run a program
true
You must check the value of argc before using argv since the program may crash if you exceed the bounds of argv.
true
argv is an array of c-style strings
true
Given the following code: class James { int a; public: void setValue(int val); }; If I used the member function "setValue", what variables can I use when I write its member function definition without declaring any new variables?
val and a
An input file stream will create a file if it doesn't already exist
wrong
ofstream means "Output File Stream" which means data coming from the file to the program.
wrong
Will the following code compile successfully? #include <string> using namespace std; struct MyStruct { string first, last; }; int main() { MyStruct s; s.first = "Hello"; return 0; }
yes
Can you use I/O manipulators with File streams?
yes without exception
In the following what tells the compiler to stop compiling the main program. int main() { // program instructions return 0; }
} or return 0;
