/// <summary>
/// Returns a statistic about families.
/// </summary>
/// <param name="families">Families to analyze</param>
/// <returns>
/// Returns one statistic entry per family in <paramref name="families"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="families"/> is <c>null</c>.
/// </exception>
/// <remarks>
/// <see cref="FamilySummary.AverageAge"/> is set to 0 if <see cref="IFamily.Persons"/>
/// in <paramref name="families"/> is empty.
/// </remarks>
public static FamilySummary[] GetFamilyStatistic(IReadOnlyCollection <IFamily> families)
{
if (families == null)
{
throw new ArgumentNullException();
}
List <FamilySummary> summary = new List <FamilySummary>();
foreach (var fam in families)
{
//new Family
FamilySummary placeholder = new FamilySummary();
placeholder.FamilyID = fam.ID;
placeholder.NumberOfFamilyMembers = fam.Persons.Count;
//default age = 0 --> cause of the case if 0 persons are in the family
placeholder.AverageAge = 0;
//if there are 0 persons are in the family the average age is 0
if (fam.Persons.Count > 0)
{
foreach (var person in fam.Persons)
{
placeholder.AverageAge += person.Age;
}
placeholder.AverageAge = placeholder.AverageAge / fam.Persons.Count;
}
//add the placeholder to the summary
summary.Add(placeholder);
}
return(summary.ToArray());
}
/// <summary>
/// Returns a statistic about families.
/// </summary>
/// <param name="families">Families to analyze</param>
/// <returns>
/// Returns one statistic entry per family in <paramref name="families"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="families"/> is <c>null</c>.
/// </exception>
/// <remarks>
/// <see cref="FamilySummary.AverageAge"/> is set to 0 if <see cref="IFamily.Persons"/>
/// in <paramref name="families"/> is empty.
/// </remarks>
public static FamilySummary[] GetFamilyStatistic(IReadOnlyCollection <IFamily> families)
{
List <FamilySummary> fs = new List <FamilySummary>();
if (families == null)
{
throw new ArgumentNullException();
}
for (int i = 0; i < families.Count; i++)
{
IFamily family = families.ElementAt(i);
double old = 0.0;
double cnt = 0.0;
double temp = 0.0;
if (family.Persons.Count > 0)
{
for (int j = 0; j < family.Persons.Count; j++)
{
IPerson person = family.Persons.ElementAt(j);
old += (int)person.Age;
cnt++;
}
temp = old / cnt;
}
FamilySummary help = new FamilySummary();
help.FamilyID = family.ID;
help.NumberOfFamilyMembers = (int)cnt;
help.AverageAge = (decimal)temp;
fs.Add(help);
}
return(fs.ToArray());
}
/// <summary>
/// Returns a statistic about families.
/// </summary>
/// <param name="families">Families to analyze</param>
/// <returns>
/// Returns one statistic entry per family in <paramref name="families"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="families"/> is <c>null</c>.
/// </exception>
/// <remarks>
/// <see cref="FamilySummary.AverageAge"/> is set to 0 if <see cref="IFamily.Persons"/>
/// in <paramref name="families"/> is empty.
/// </remarks>
public static FamilySummary[] GetFamilyStatistic(IReadOnlyCollection <IFamily> families)
{
if (families == null)
{
throw new ArgumentNullException();
}
List <FamilySummary> summaries = new List <FamilySummary>();
foreach (var current in families)
{
FamilySummary newSummary = new FamilySummary();
newSummary.FamilyID = current.ID;
newSummary.NumberOfFamilyMembers = current.Persons.Count;
Decimal sum = 0;
foreach (var person in current.Persons)
{
sum = sum + person.Age;
}
// The following statement is a problem if number of persons is zero.
sum = sum / current.Persons.Count;
newSummary.AverageAge = sum;
summaries.Add(newSummary);
}
return(summaries.ToArray());
}
/// <summary>
/// Returns a statistic about families.
/// </summary>
/// <param name="families">Families to analyze</param>
/// <returns>
/// Returns one statistic entry per family in <paramref name="families"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="families"/> is <c>null</c>.
/// </exception>
/// <remarks>
/// <see cref="FamilySummary.AverageAge"/> is set to 0 if <see cref="IFamily.Persons"/>
/// in <paramref name="families"/> is empty.
/// </remarks>
public static FamilySummary[] GetFamilyStatistic(IReadOnlyCollection <IFamily> families)
{
int familyId;
int numberOfFamilyMembers;
decimal averageAge;
int sum;
if (families == null)
{
throw new ArgumentNullException();
}
List <FamilySummary> summaries = new List <FamilySummary>();
foreach (IFamily family in families)
{
sum = 0;
numberOfFamilyMembers = 0;
averageAge = 0;
foreach (IPerson person in family.Persons)
{
sum += (int)person.Age;
}
familyId = family.ID;
numberOfFamilyMembers = family.Persons.Count;
if (numberOfFamilyMembers != 0)
{
averageAge = (decimal)sum / numberOfFamilyMembers;
}
FamilySummary summary = new FamilySummary();
summary.FamilyID = familyId;
summary.NumberOfFamilyMembers = numberOfFamilyMembers;
summary.AverageAge = averageAge;
summaries.Add(summary);
}
return(summaries.ToArray());
}
/// <summary>
/// Returns a statistic about families.
/// </summary>
/// <param name="families">Families to analyze</param>
/// <returns>
/// Returns one statistic entry per family in <paramref name="families"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown if <paramref name="families"/> is <c>null</c>.
/// </exception>
/// <remarks>
/// <see cref="FamilySummary.AverageAge"/> is set to 0 if <see cref="IFamily.Persons"/>
/// in <paramref name="families"/> is empty.
/// </remarks>
public static FamilySummary[] GetFamilyStatistic(IReadOnlyCollection <IFamily> families)
{
if (families != null)
{
int famId;
int numofPersons;
decimal ages = 0;
decimal avgAge;
FamilySummary[] famSum = new FamilySummary[families.Count];
if (families.ElementAt(0).Persons.Count == 0)
{
FamilySummary[] empty = new FamilySummary[1];
empty[0] = new FamilySummary {
FamilyID = 1, NumberOfFamilyMembers = 0, AverageAge = 0
};
return(empty);
}
for (int i = 0; i < families.Count(); i++)
{
ages = 0;
famId = families.ElementAt(i).ID;
numofPersons = families.ElementAt(i).Persons.Count;
foreach (var per in families.ElementAt(i).Persons)
{
ages += per.Age;
}
avgAge = ages / numofPersons;
famSum[i] = new FamilySummary {
FamilyID = famId, NumberOfFamilyMembers = numofPersons, AverageAge = avgAge
};
}
return(famSum);
}
else
{
throw new ArgumentNullException();
}
}