CSC 215

Fall '98

Section 701

Sample midterm questions

Listed below are solutions to the sample questions I posted earlier.

Write a function with the header:

  double average(double a, double b)

that returns the average of a and b.

Solution:

  double average(double a, double b)
  {
    return (a + b) / 2.0;
  }

Write a function with the header:

  int minimum(int i, int j)

that returns the smaller of i and j.

Solution:

  int minimum(int i, int j)
  {
    if (i < j) {
      return i;
    }
    else {
      return j;
    }
  }

Write a function with the header:
```
  double convert(double Britishpounds)
  
```
where Britishpounds contains an amount in British pounds sterling; the function should return what that amount is in US dollars. The conversion rate is 0.66 pounds per dollar.
Solution:
```
  double convert(double Britishpounds)
  {
    const double rate = 0.66;

    return Britishpounds / rate;
  }
```

Write a function with the header:

  int sum(int n)

that returns the sum of the integers from 1 to n.

  int sum(int i, int n)
  {
    int answer = 0;
    int index;
    for (index = i; index <= n; index++) {
      answer += index;
    }
    return answer;
  }

Write a function with the header:
```
  int getMonth()
  
```
that prints the prompt "Please enter a month: " and then accepts only a value between 1 and 12. It should work by looping until the user enters a legal value. It then returns the user's answer.
```
  int getMonth()
  {
    int answer;
    do {
      cout << "Please enter a month: ";
      cin >> answer;
    } while (answer < 1 || answer > 12);

    return answer;
  }
```

What is printed by the following program?

//
// 
//

#include <iostream.h>

int square(int n);

int main()
{
  int index;
  int limit = 5;
  int answer = 0;

  for (index = 1; index <= limit; index++) {
    cout << index << ", " << square(index) << endl;
    answer = answer + square(index);
  }

  cout << answer << endl;
  return 0;
}

int square(int n)
{
  int answer;
  answer = n * n;
  return answer;
}

The program prints:

What is printed by the following program?

//
// 
//

#include <iostream.h>

int main()
{
  int value = 32;

  while (value > 1) {
    cout << value << endl;
    value = value / 2;
  }

  return 0;
}

The program prints: