Exercise 2-4 (CountWord)

Chapter_2     Exercise_2-3

Exercise_2-5

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Exercise 2-4     TCP1, p. 120

Exercise 2-4. Create a program that counts the occurrence of a particular word in a file (use the string class' operator '==' to find the word).

CountWord.cpp         download

// Counts the occurrences of a whitespace-separated word in the file
#include <string>
#include <iostream>
#include <fstream>
using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::ifstream;

int main()
{
int occurrences = 0;
string word, lookfor;

cout << "Word to look for in the file: ";
cin >> lookfor;

ifstream in("CountWord.cpp");

while(in >> word)
{
if (word == lookfor)
{occurrences++;}
}

cout << "Number of occurrences of '" << lookfor
<< "': " << occurrences << endl;
}
/*
g++ CountWord.cpp -o CountWord
./CountWord
Word to look for in the file: word
Number of occurrences of 'word': 2

./CountWord
Word to look for in the file: word,
Number of occurrences of 'word,': 2

./CountWord
Word to look for in the file: word)
Number of occurrences of 'word)': 2

./CountWord
Word to look for in the file: (word
Number of occurrences of '(word': 2

./CountWord
Word to look for in the file: ==
Number of occurrences of '==': 2

./CountWord
Word to look for in the file: >>
Number of occurrences of '>>': 3

./CountWord
Word to look for in the file: <<
Number of occurrences of '<<': 7

./CountWord
Word to look for in the file: occurrences
Number of occurrences of 'occurrences': 13
*/

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