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CS223 Exercises

Section 1.1 Homework 1

The goal of this assignment is to give you some practice writing simple C++ programs and to check your knowledge of some of the main concepts of basic C++.
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Exercises Exercises

1.

Write a C++ program that will use ’cout’ and the output stream operator ’<<’ to produce the following output:
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Howdy, partner!
What's new in town?
Note: You have been given the first two lines of the program (the #include and using namespace).
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2.

Write a C++ program that will output the names of Dr. Wilson’s and Dr. Wahl’s cats, one name per line. Output the names in alphabetical order.
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Dr. Wilson’s cats: Ziggy, Cleo, Spike, Skye
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Dr. Wahl’s cats: Mr. Grey, Xerea
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Note: For this problem you will need to type in the ’include’ and ’namespace’ lines at the top of your program.
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3.

The following line of C++ code tells the compiler what?
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#include <iostream>
  • Take the code from the file called iostream and paste it into the program before creating the executable.
  • Execute the code in the file called iostream before creating the executable for the current program.
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4.

What punctuation ends most lines of C++ code?
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  • //
  • ;
  • :
  • <<
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5.

The following line of C++ code tells the compiler what?
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int main()
  • There is a function named main that returns an integer.
  • There is a variable named main that is of type integer.
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6.

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7.

What is the one function that all C++ programs must contain?
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  • start()
  • system()
  • main()
  • include()
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8.

What header file do you need to use to get access to ’cout’?
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  • stream
  • nothing, because cout is available by default
  • iostream
  • namespace
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9.

The following line of C++ code tells the compiler what?
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int myvar;
  • There is a function named myvar that returns an integer.
  • There is a variable named myvar that is of type integer.
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10.

Which of the following is a complete C++ program that will compile and run without error?
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  • int main()
{
    return 0;
}

  • def main():
   return

  • main()
{
   # your code here
}

  • def main()
{
   return;
}
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11.

Which of the following is NOT a valid variable declaration?
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  • int a, b, c, d;
  • double pi = 3.14159;
  • cin >> thisisanumber;
  • char letter;
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12.

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13.

Write a C++ program that reads in two integers entered by the user, adds them together, and outputs the sum.
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14.

Write a C++ program that reads in two numbers with a decimal point entered by the user, subtracts the second number from the first, and outputs the difference.
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15.

Write a simple calculator program in C++. Your program should:
  • read in two decimal numbers (i.e., numbers may not be integers)
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  • give the results for the following calculations
    • adding the two numbers together
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    • subtracting the second number from the first
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    • multiplying the two numbers together
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    • dividing the first number by the second
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  • produce output formatted like the given example
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16.

Which of the following is NOT one of the basic (i.e., "primitive") data types available to you in C++?
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  • string
  • int
  • char
  • double
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17.

Given that variable ’num’ currently has the value 0, which of the following segments of code, when executed, will NOT result in ’num’ having the value 3?
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  • num == 3;

  • num++;
num++;
num++;

  • num += 3

  • num = num + 3;
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18.

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19.

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20.

Write a simple C++ program that will read in from standard input three strings representing a person’s last name, first name, and middle initial, and then output the person’s full name formatted like the given example.
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21.

Which of the following snippets of C++ code will read a single integer from standard input?
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  • int myint;
cin >> myint;

  • double a;
cin >> a;

  • int thisisanumber;
cout << thisisanumber;

  • int myint;
cin << myint;
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22.

Which of the following will NOT cause a compiler error (though it *might* cause a compiler warning)?
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  • Using a variable without first initializing it.
  • Using a variable without first declaring it.
  • Declaring a variable more than once in the same block of code.
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23.

The following line of code will do what?
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x -= 5;
  • subtract 5 from the current value of ’x’
  • assign the value 5 to ’x’
  • add 5 to the current value of ’x’
  • compare the value of `x` to 5
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24.

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25.

Which of the following is NOT a part of the C++ build process?
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  • Postprocessing
  • Preprocessing
  • Compiling
  • Linking
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26.

When would you get an error related to an undefined function?
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  • During the link phase
  • During the compilation phase
  • At program startup
  • When your executable calls the function for the first time
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27.

What advantage is there to having separate compile and link steps in the build process?
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  • It allows only changed files to be recompiled, saving compilation time.
  • None, it’s confusing and it probably makes things slower since you have multiple programs running together.
  • It makes it easier to diagnose errors because you know whether the problem is from the linker or the compiler.
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