Question 1

What output will be produced when the following code is executed? (Assume these lines are embedded in complete,correct programs,with proper #include directives. )
cout << "*";
cout.width(5);
cout << 123
<< "*" << 123 << "*" << endl;
cout << setw(5)<< 123 << "*" << 123 << "*" << endl;

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Question 2

Assume you have opened and connected stream variables fileIn and fileOut.Assume further that you have finished with the input and output files.Write the statements necessary to close these files.

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Question 3

Given the following code.The input file,in.dat,is a copy of the program code in this problem.How will the output file,out.dat,differ from the input file? // file: testQuestion.cc // test question: copy files: in.dat to out.dat // in.dat is a copy of a file containing this code. // use EOF to terminate copy loop #include #include // for exit() using namespace std; int main() { ifstream in; ofstream out; in.open("in.dat"); out.open("out.dat"); while(in >> ch) out << ch; return 0; }

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Question 4

Assume you have opened and connected stream variables fileIn and fileOut.Assume further that you have finished with input file,but want to read the input file a second time.What is necessary to set the stream state to reread the file from the start? Explain.

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Question 5

You have a file that is not empty.You open a file stream for write,and attach the stream to the file.Then you close the file.What is now in that file?

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Question 6

What output is produced by the following code,assuming these lines of code are embedded in a correct program?
cout << "*" << setw(5)<< 123 << "*"
<< 123 << "*" << endl;
cout.setf(ios::showpos);
cout << "*" << setw(5)<< 123 << "*"
<< 123 << "*" << endl;
cout.unsetf(ios::showpos):
cout.setf(ios::left);
cout << "*" << setw(5)<< 123 << "*"
<< setw(5)<< 123 << "*" << endl;

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Question 7

You are writing a program.Give the necessary statements to open a file and to confirm that the file has been successfully opened for writing.Important: Why bother to test?

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Question 8

You have a file that is not empty,and you want to preserve the contents and append to the end of the file.Give the commands necessary to open a file for appending.

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Question 9

Write a loop that will read from the current position in a file up to the end of the current line,and send this output to the screen.You may assume that any variables you need are declared,including file variables,and that any needed files have been successfully opened.

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The answer of Write a loop that will read from...

Question 10

Write a program that prompts for an input file name,receives the input file name in a C-string.The program should check for errors opening a file.It is not necessary for the program to do anything other than open the file.

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The answer of Write a program that prompts for an...

Question 11

What is sent to screen when the following is executed,assuming that these lines of code are embedded in a correct,complete program? Explain this behavior.
cout << "*" << setw(3)<< 123456 << "*" << endl;

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The answer of What is sent to screen when the...

Question 12

What will be the output from this code fragment if embedded in an otherwise correct and complete C++ program that is supplied the following input? Input: 12 23 45 Code: ifstream inStream("File.txt"); int i = 0,next; while (cin >> next) { $\quad$i++; $\quad$cout << next << end; } inStream.close(); cout << count << flush;

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The answer of What will be the output from this...

Question 13

Write a function that will copy the contents of file in.dat to the file out.dat.Check for successful file opening of both in.dat and out.dat.The loop that actually does the copy should terminate on end of file.

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Question 14

What happens to output when data is sent to the output stream width that is wider than that set with the setw(int)manipulator,or equivalently,with cout.width(int)?

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Question 15

Declare and open input file stream fileIn and output file stream fileOut.Attach these to files named input.dat and output.dat.Write #include directives for any required header files.Make certain names from namespaces are accessible.

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The answer of Declare and open input file stream fileIn...

Question 16

You have to #include as well as #include when you use a line of code such as cout << setw(8)<< 123456 << endl; but not have to #include when you do the exact equivalent thing in cout.width(8); cout << 123456 << endl; Why is this?

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The answer of You have to #include <iomanip> as well...

Question 17

There are three calls to member functions of ostream object cout that set the format of stream output so that the format of the output is in fixed point,a decimal point always shows,and there are two places of decimals after the decimal point.Give these statements along with the necessary #include and using statements.

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The answer of There are three calls to member functions...

Question 18

Assume that your program opens a file stream,has a file connected,and writes to the file.What changes need to be made to make your program write to the screen? (There will be stuff you need to delete and stuff that you need to change. )

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Question 19

What output is produced by the following code,assuming these lines of code are embedded in a correct program?
cout << "*" << setw(5)<< 123;
cout.setf(ios::left);
cout << "*" << setw(5)<< 123;
cout.setf(ios::right);
cout << "*" << setw(5)<< 123 << "*" << endl;

Accepted Answer

The answer of What output is produced by the following...

Question 20

What output is sent to the file out.dat by the following code,assuming these lines of code are embedded in a correct program?
ofstream fout;
fout.open("out.dat");
fout << "*" << setw(5)<< 123 << "*"
<< 123 << "*" << endl;
fout.setf(ios::showpos);
fout << "*" << setw(5)<< 123 << "*"
<< 123 << "*" << endl;
fout.unsetf(ios::showpos):
fout.setf(ios::left);
fout << "*" << setw(5)<< 123 << "*"
<< setw(5)<< 123 << "*" << endl;

Accepted Answer

The answer of What output is sent to the file...

Quiz 12: Streams and File IO

What output will be produced when the following code is executed? (Assume these lines are embedded in complete,correct programs,with proper #include directives. ) cout << ""; cout.width(5); cout << 123 << "" << 123 << "" << endl; cout << setw(5)<< 123 << "" << 123 << "*" << endl;

Assume you have opened and connected stream variables fileIn and fileOut.Assume further that you have finished with the input and output files.Write the statements necessary to close these files.

Assume you have opened and connected stream variables fileIn and fileOut.Assume further that you have finished with input file,but want to read the input file a second time.What is necessary to set the stream state to reread the file from the start? Explain.

You have a file that is not empty.You open a file stream for write,and attach the stream to the file.Then you close the file.What is now in that file?

You are writing a program.Give the necessary statements to open a file and to confirm that the file has been successfully opened for writing.Important: Why bother to test?

You have a file that is not empty,and you want to preserve the contents and append to the end of the file.Give the commands necessary to open a file for appending.

Write a loop that will read from the current position in a file up to the end of the current line,and send this output to the screen.You may assume that any variables you need are declared,including file variables,and that any needed files have been successfully opened.

Write a program that prompts for an input file name,receives the input file name in a C-string.The program should check for errors opening a file.It is not necessary for the program to do anything other than open the file.

What is sent to screen when the following is executed,assuming that these lines of code are embedded in a correct,complete program? Explain this behavior. cout << "" << setw(3)<< 123456 << "" << endl;

Write a function that will copy the contents of file in.dat to the file out.dat.Check for successful file opening of both in.dat and out.dat.The loop that actually does the copy should terminate on end of file.

What happens to output when data is sent to the output stream width that is wider than that set with the setw(int)manipulator,or equivalently,with cout.width(int)?

Declare and open input file stream fileIn and output file stream fileOut.Attach these to files named input.dat and output.dat.Write #include directives for any required header files.Make certain names from namespaces are accessible.

You have to #include <iomanip> as well as #include <iostream> when you use a line of code such as cout << setw(8)<< 123456 << endl; but not have to #include <iomanip> when you do the exact equivalent thing in cout.width(8); cout << 123456 << endl; Why is this?

Assume that your program opens a file stream,has a file connected,and writes to the file.What changes need to be made to make your program write to the screen? (There will be stuff you need to delete and stuff that you need to change. )

What output is produced by the following code,assuming these lines of code are embedded in a correct program? cout << "" << setw(5)<< 123; cout.setf(ios::left); cout << "" << setw(5)<< 123; cout.setf(ios::right); cout << "" << setw(5)<< 123 << "" << endl;

Quiz 12: Streams and File IO

What output will be produced when the following code is executed? (Assume these lines are embedded in complete,correct programs,with proper #include directives. ) cout << "*"; cout.width(5); cout << 123 << "*" << 123 << "*" << endl; cout << setw(5)<< 123 << "*" << 123 << "*" << endl;

Assume you have opened and connected stream variables fileIn and fileOut.Assume further that you have finished with the input and output files.Write the statements necessary to close these files.

Assume you have opened and connected stream variables fileIn and fileOut.Assume further that you have finished with input file,but want to read the input file a second time.What is necessary to set the stream state to reread the file from the start? Explain.

You have a file that is not empty.You open a file stream for write,and attach the stream to the file.Then you close the file.What is now in that file?

You are writing a program.Give the necessary statements to open a file and to confirm that the file has been successfully opened for writing.Important: Why bother to test?

You have a file that is not empty,and you want to preserve the contents and append to the end of the file.Give the commands necessary to open a file for appending.

Write a loop that will read from the current position in a file up to the end of the current line,and send this output to the screen.You may assume that any variables you need are declared,including file variables,and that any needed files have been successfully opened.

Write a program that prompts for an input file name,receives the input file name in a C-string.The program should check for errors opening a file.It is not necessary for the program to do anything other than open the file.

What is sent to screen when the following is executed,assuming that these lines of code are embedded in a correct,complete program? Explain this behavior. cout << "*" << setw(3)<< 123456 << "*" << endl;

Write a function that will copy the contents of file in.dat to the file out.dat.Check for successful file opening of both in.dat and out.dat.The loop that actually does the copy should terminate on end of file.

What happens to output when data is sent to the output stream width that is wider than that set with the setw(int)manipulator,or equivalently,with cout.width(int)?

Declare and open input file stream fileIn and output file stream fileOut.Attach these to files named input.dat and output.dat.Write #include directives for any required header files.Make certain names from namespaces are accessible.

You have to #include <iomanip> as well as #include <iostream> when you use a line of code such as cout << setw(8)<< 123456 << endl; but not have to #include <iomanip> when you do the exact equivalent thing in cout.width(8); cout << 123456 << endl; Why is this?

Assume that your program opens a file stream,has a file connected,and writes to the file.What changes need to be made to make your program write to the screen? (There will be stuff you need to delete and stuff that you need to change. )

What output is produced by the following code,assuming these lines of code are embedded in a correct program? cout << "*" << setw(5)<< 123; cout.setf(ios::left); cout << "*" << setw(5)<< 123; cout.setf(ios::right); cout << "*" << setw(5)<< 123 << "*" << endl;

What output will be produced when the following code is executed? (Assume these lines are embedded in complete,correct programs,with proper #include directives. ) cout << ""; cout.width(5); cout << 123 << "" << 123 << "" << endl; cout << setw(5)<< 123 << "" << 123 << "*" << endl;

What is sent to screen when the following is executed,assuming that these lines of code are embedded in a correct,complete program? Explain this behavior. cout << "" << setw(3)<< 123456 << "" << endl;

What output is produced by the following code,assuming these lines of code are embedded in a correct program? cout << "" << setw(5)<< 123; cout.setf(ios::left); cout << "" << setw(5)<< 123; cout.setf(ios::right); cout << "" << setw(5)<< 123 << "" << endl;