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Recap - Word Frequency

Part of the Logic & Flow section of Coddy's C++ journey — lesson 29 of 56.

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Challenge

Easy

Create a program that counts word frequencies in a text passage using a std::map. Your program will track how many times each unique word appears and then report the frequency of a specific word.

The following inputs will be provided:

  • An integer n representing the number of words in the text
  • Then n strings representing the words in the text
  • A string representing the target word to check frequency for

Your program should:

  1. Create a std::map<std::string, int> named wordCount
  2. Read the number of words
  3. For each word, read it and update its count in the map using the square bracket operator and increment
  4. Read the target word to check
  5. Print the frequency of the target word using the format shown below

Use the following exact output format:

The word "[target_word]" appears [frequency] times

If the target word doesn't exist in the map, accessing it with the square bracket operator will automatically create an entry with a count of 0, so you can safely print the frequency without checking if the word exists first. Use wordCount[word]++ to increment the count for each word as you read it - this will create new entries with count 1 for new words, or increment existing counts for words already seen.

Try it yourself

#include <iostream>
#include <map>
#include <string>
using namespace std;

int main() {
    // Read the number of words
    int n;
    cin >> n;
    
    // Create the map to store word frequencies
    map<string, int> wordCount;
    
    // TODO: Write your code here
    // Read n words and update their counts in the map
    // Then read the target word and output its frequency
    
    return 0;
}

All lessons in Logic & Flow

1Pointers and Memory

What is a Pointer?Address-Of OperatorDereference OperatorNull PointersPointers and ArraysDynamic Memory with 'new'Freeing Memory with 'delete'Recap - Pointer Practice

4Maps (Key-Value Pairs)

Introducing std::mapCreating a MapAccessing and Modifying ValuesChecking for KeysRemoving PairsIterating Over a MapRecap - Word Frequency

7Advanced Functions

Pass by ReferenceIntro Lambda ExpressionsLambdas with ParametersLambdas with Return ValuesIntroduction to RecursionRecursive FactorialLambda Sort

2Vectors (Dynamic Arrays)

Introducing std::vectorCreating a VectorAdding ElementsAccessing ElementsVector SizeIterating with a For LoopRange-Based For LoopRemoving ElementsRecap - Vector Operations

5Project: Inventory Tool

Project SetupAdding and Updating ItemsProject lessonChecking StockProject lessonRemoving StockProject lessonPrinting the Inventory ReportProject lesson

8Basic Error Handling

Introduction to ExceptionsThe 'try' and 'catch' BlocksThe 'throw' KeywordDifferent Exception TypesThe Catch-All HandlerRecap - Safe Division

3Project: Task List Tool

Project OverviewAdding a TaskProject lessonViewing TasksProject lessonRemoving a TaskProject lessonFinishing the ToolProject lesson

6Sets (Unique Elements)

Introducing std::setCreate Set & Add ElementsChecking for ElementsRemoving ElementsIterating Over a SetRecap - Unique Numbers

9Final Challenges

Vector Data FilteringMap Value SearchPointer and Dynamic Array