Вычислите количество букв "а" в слове.

#include <iostream>
#include <string>
#include <algorithm>
 
static const char findChar = 'a';
 
bool compare(const char var)
{
     return var == findChar;
}
 
int main()
{
 std::string word;
 std::cout << "Input word : "; std::getline(std::cin, word);
 std::cout << "In word found char : " << findChar << " : " 
        << std::count_if(word.begin(), word.end(), compare) << std::endl;
 
  system("PAUSE");
  return 0;
}

#include <algorithm>
#include <iostream>
#include <string>
 
size_t countOfCharInString(const std::string word, const char symbol = 'a');
 
int main()
{
    const size_t wordsCount(5);
    std::cout << "Input " << wordsCount << " words: " << std::endl;
    for (size_t i = 0; i < wordsCount; i++) {
        std::string currentWord;
        std::cout << "Word #" << (i + 1) << ": ";
        std::cin >> currentWord;
        std::cout << "Count of symbol in the string: " << countOfCharInString(currentWord) << std::endl;
    }
    
    std::system("pause");
    return 0;
}
 
size_t countOfCharInString(const std::string word, const char symbol)
{
    return std::count(word.begin(), word.end(), symbol);
}