logo CodeStepByStep logo

byAge

Language/Type: C++ Map collections
Related Links:

Write a function named byAge that accepts three parameters: 1) a reference to a Map where each key is a person's name (a string) and the associated value is that person's age (an integer); 2) an integer for a minimum age; and 3) an integer for a max age. Your function should return a new map with information about people with ages between the min and max, inclusive.

In your result map, each key is an integer age, and the value for that key is a string with the names of all people at that age, separated by "and" if there is more than one person of that age. The order of names for a given age should be in alphabetical order, such as "Bob and Carl" rather than "Carl and Bob". (This is the order in which they naturally occur in the parameter map.) Include only ages between the min and max inclusive, where there is at least one person of that age in the parameter map. If the map passed is empty, or if there are no people in the map between the min/max ages, return an empty map.

For example, if a map named ages stores the following key:value pairs:

{"Allison":18, "Benson":48, "David":20, "Erik":20, "Galen":15, "Grace:25,
"Helene":40, "Janette":18, "Jessica":35, "Marty":35, "Paul":28, "Sara":15,
"Stuart":98, "Tyler":6, "Zack":20}

The call of byAge(ages, 16, 25) should return the following map:

{18:"Allison and Janette", 20:"David and Erik and Zack", 25:"Grace"}

For the same map, the call of byAge(ages, 20, 40) should return the following map:

{20:"David and Erik and Zack", 25:"Grace", 28:"Paul", 35:"Jessica and Marty", 40:"Helene"}

Constraints: Obey the following restrictions in your solution.

  • You will need to construct a map to store your results, but you may not use any other structures (arrays, lists, etc.) as auxiliary storage. (You can have as many simple variables as you like.)
  • You should not modify the contents of the map passed to your function.
Type your C++ solution code here:


This is a function exercise. Write a C++ function as described. Do not write a complete program; just the function(s) above.

You must log in before you can solve this problem.

Log In

Need help?

If you do not understand how to solve an exercise or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect tests, etc.), please

Is there a problem? Contact a site administrator.

©, all rights reserved.