ch4 malik, CS 150 Chapter 3, Chapter 1 - C++ Programming, Chapter 2 - C++ Programming
inFile.open("progdata.dat");
Consider the following program segment. ifstream inFile; //Line 1 int x, y; //Line 2 ... //Line 3 inFile >> x >> y; //Line 4 Which of the following statements at Line 3 can be used to open the file progdata.dat and input data from this file into x and y at Line 4?
member access
In C++, the dot is an operator called the ____ operator.
member access
In C++, the dot is an operator called the ____________________operator.
false
In a one-way selection, if a semicolon is placed after the expression in an if statement, the expression in the if statement is always true.
false
In an output statement, each occurrence of endl advances the cursor to the end of the current line on an output device.
char
In the C++ statement, cin.get(u); u must be a variable of type ____________________.
false
In the statement cin >> x;, x can be a variable or an expression.
True
Information stored in main memory must be transfered to some other device for permanent storage.
alpha = 17, ch = 'A'
Suppose that alpha is an int variable and ch is a char variable and the input is: 17 A What are the values after the following statements execute? cin >> alpha; cin >> ch;
300
Suppose that alpha, beta, and gamma are int variables and the input is: 100 110 120 200 210 220 300 310 320 What is the value of gamma after the following statements execute? cin >> alpha; cin.ignore(100, '\n'); cin >> beta; cin.ignore(100,'\n'); cin >> gamma;
X
Suppose that ch1 and ch2 are char variables and the input is: WXYZ What is the value of ch2 after the following statements execute? cin >> ch1; ch2 = cin.peek(); cin >> ch2;
W
Suppose that ch1 and ch2 are char variables and the input is: WXYZ What is the value of ch2 after the following statements execute? cin.get(ch1); cin.putback(ch1); cin >> ch2;
ch1 = 'A', ch2 = ' ', alpha = 18
Suppose that ch1 and ch2 are char variables, alpha is an int variable, and the input is: A 18 What are the values after the following statement executes? cin.get(ch1); cin.get(ch2); cin >> alpha;
'C'
Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B C Choose the value of ch3 after the following statement executes: cin >> ch1 >> ch2 >> ch3;
'B'
Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B C What is the value of ch3 after the following statements execute? cin.get(ch1); cin.get(ch2); cin.get(ch3);
outFile.open("outputData.out");
Suppose that outFile is an ofstream variable and output is to be stored in the file outputData.out. Which of the following statements opens the file outputData.out and associates outFile to the output file?
1565.683 85.7800 123.98
Suppose that x = 1565.683, y = 85.78, and z = 123.982. What is the output of the following statements? cout << fixed << showpoint; cout << setprecision(3) << x << ' '; cout << setprecision(4) << y << ' ' << setprecision(2) << z << endl;
25.67 356.88 7623.97
Suppose that x = 25.67, y = 356.876, and z = 7623.9674. What is the output of the following statements? cout << fixed << showpoint; cout << setprecision(2); cout << x << ' ' << y << ' ' << z << endl;
55.680 476.859 23.82
Suppose that x = 55.68, y = 476.859, and z = 23.8216. What is the output of the following statements? cout << fixed << showpoint; cout << setprecision(3); cout << x << ' ' << y << ' ' << setprecision(2) << z << endl;
This statement results in input failure
Suppose that x and y are int variables, ch is a char variable, and the input is: 4 2 A 12 Choose the values of x, y, and ch after the following statement executes: cin >> x >> ch >> y;
x = 28, y = 32, z = 0.6
Suppose that x and y are int variables, z is a double variable, and the input is: 28 32.6 12 Choose the values of x, y, and z after the following statement executes: cin >> x >> y >> z;
cin >> x >> y;
Suppose that x and y are int variables. Which of the following is a valid input statement?
x = 10, y = 20.7
Suppose that x is an int variable and y is a double variable and the input is: 10 20.7 Choose the values after the following statement executes: cin >> x >> y;.
ch = '276', x = '.'
Suppose that x is an int variable, ch is a char variable, and the input is: 276. Choose the values after the following statement executes: cin >> ch >> x;
setw
The manipulator ____________________ is used to output the value of an expression in a specific number of columns.
true
The number of input data extracted by cin and >> depends on the number of variables appearing in the cin statement.
true
The order in which statements execute in a program is called the flow of control.
C
The programming language C++ evolved from ____.
1980s
The programming language C++ was designed by Bjarne Stroustrup at Bell Laboratories in the early ____.
false
The result of a logical expression cannot be assigned to an int variable
putback
The stream function ____________________ lets you put the last character extracted from the input stream by the get function back into the input stream.
gigabyte
The term GB refers to ___.
analyzing the problem
To develop a program to solve a problem, you start by ____.
True
To develop a program to solve a problem, you start by analyzing the problem.
iomanip
To use a parameterized stream manipulator in a program, you must include the header file ____________________.
iomanip
To use the manipulator setprecision, the program must include the header file ____________________.
selection and repetition
Two most common control structures are: __ ___
nested
when one control statement is located within another, it is said to be ____
loader
A program that loads an executable program into main memory is called a ___.
byte
A sequence of eight bits is called a ____.
algorithm
A step-by-step problem-solving process in which a solution is arrived at in a finite amount of time is caled an ____.
short-circuit evaluation
A process in which the computer evaluates a logical expression from left to right and stops as soon as the value of the expression is known.
linker
A program called a ___ combines the object program with the programs from libraries.
compiler
A program called a ____ translates instructions written in high-level languages into machine code.
relational operator
A __ allows you to make comparisons in a program
object
An ___ consists of data and the operations on those data.
logical (boolean) expression
An expression that has a value of either true or false
predefined or pre defined or pre-defined
C++ comes with a wealth of functions, called ____________________ functions, that are written by other programmers.
classes
C++ has a special name for the data types istream and ostream. They are called ____________________.
False
C++ programs have always been portable from one compiler to another.
fstream
C++ provides a header file called ____________________, which is used for file I/O.
istream
The functions get, ignore, and so on are members of the data type ____________________.
structured
Dividing a problem into smaller subproblems is called ___ design.
true
Entering a char value into an int variable causes serious errors, called input failure.
false
Every if statement must have a corresponding else
false
If input failure occurs in a C++ program, the program terminates immediately and displays an error message.
false
It is a good idea to redefine cin and cout in your programs.
memory cells
Main memory is an ordered sequence of items, called ___.
random access memory
Main memory is called ____.
True
Main memory is directly connected to the CPU.
iostream
Manipulators without parameters are part of the ____ header file.
cin.setf(ios::fixed);
On some compilers, the statements cin >> fixed; and cin >> scientific; might not work. In this case, you can use the statement ____________________ in place of cin >> fixed;.
cin.setf(ios::left);
On some compilers, the statements cin >> left; and cin >> right; might not work. In this case, you can use the statement ____________________ in place of cin >> left;.
mainframe, midsize, and micro
Several categories of computers exist, such as ____.
x = 15, ch = 'A', y = 73.2
Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is: 15A 73.2 Choose the values after the following statement executes: Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is: 15A 73.2 Choose the values after the following statement executes: cin >> x >> ch >> y;
x = 15, y = 76.3, z = 14
Suppose that x is an int variable, y is a double variable, z is an int variable, and the input is: 15 76.3 14 Choose the values after the following statement executes: cin >> x >> y >> z;
CPU
The ___ is the brain of the computer and the single most expensive peice of harware in your personal computer.
operating system
The ___ monitors the overall activity of the computer and provides services.
switch
The ___ structure is sued to handle multiway selection
input, output, storage
The basic commands that a computer performs are ___, and performance of arithmetic and logical operations.
True
The basic commands that a computer performs are input, output, storage, and performance of arithmetic and logical operations.
False
The command that does the linking on Visuall C++ 2010 Express and Visual Studio 2010 is Make or Remake.
False
The device that stores information permanently (unless the device becomes unusable or you change the information by rewriting it) is called primary storage.
input
The devices that feed data and programs into computers are called ___ devices.
False
The devices that feed data and programs into computers are called output devices.
output
The devices that the computer uses to display results are called ___ devices.
bit
The digit 0 or 1 is called a binary digit or ____.
false
The expression !(x>0) is true only if x is a negative number
false
The expression in a switch statement should evaluate to a value of the simple data type.
true
The expression in the if statement: if (score = 30) grade = 'A'; always evaluates to true
false
The expression: (ch >= 'A' && ch <= 'Z') evaluates to false if either ch <'A' or ch >= 'Z'.
false
The extraction operator >> skips only all leading blanks when searching for the next data in the input stream.
false
The following statements will result in input failure if the input values are not on a separate line. (Assume that x and y are int variables.) cin >> x; cin >> y;
peek
The function ____________________ returns the next character in the input stream; it does not remove the character from the input stream.
123456789012345678901234567890 ####Mickey Donald*****Goofy
What is the output of the following statements? cout << "123456789012345678901234567890" << endl cout << setfill('#') << setw(10) << "Mickey" << setfill(' ') << setw(10) << "Donald" << setfill('*') << setw(10) << "Goofy" << endl;
12345678901234567890 ***18**Happy**Sleepy
What is the output of the following statements? cout << setfill('*'); cout << "12345678901234567890" << endl cout << setw(5) << "18" << setw(7) << "Happy" << setw(8) << "Sleepy" << endl;
true
When reading data into a char variable, after skipping any leading whitespace characters, the extraction operator >> finds and stores only the next character; reading stops after a single character.
False
When the computer is turned off, everything in secondary memory is lost.
main memory
When the power is switched off, everything in ___ is lost.
False
When you compile your program, the compiler identifies the logic errors and suggests how to correct them.
ignore
When you want to process only partial data, you can use the stream function ____ to discard a portion of the input.
unsetf
You can disable the manipulator left by using the stream function ____________________.
true
You can use the function getline to read a string containing blanks.
Unicode
___ consists of 65,536 characters.
Application
___ progrmas perform a specific task.
Digital signals
___ represent information with a sequence of 0s and 1s.
Control structures
____ alter the normal flow of control
setfill
____ is a parameterized stream manipulator.
istream
cin is called a(n) ____________________ object.
false
in C++, both ! and != are logical operators
