testsAndMisc/CPP/miscelanious/howOftenDoesCharOccur.cpp

#include <iostream>
#include <vector>

struct charOccurence {
  char c;
  int occurrence;
};

void printCharOccurenceVector(const std::vector<charOccurence> v) {
  std::cout << "[";
  for (unsigned int i = 0; i < v.size(); i++) {
    std::cout << "(\"" << v.at(i).c << "\", " << v.at(i).occurrence << ")"
              << (i + 1 == v.size() ? "" : ", ");
  }
  std::cout << "]" << std::endl;
}

int main() {
  std::vector<charOccurence> list;
  std::string userInput = "aaaabbbcca";
  charOccurence newCharOccurence;
  newCharOccurence.c = userInput.at(0);
  newCharOccurence.occurrence = 1;
  for (unsigned int i = 1, j = 1; i < userInput.length(); i++) {
    char newCharacter = userInput.at(i);
    if (newCharacter != newCharOccurence.c) {
      list.push_back(newCharOccurence);
      j = 1;
      newCharOccurence.c = newCharacter;
      newCharOccurence.occurrence = j;

    } else {
      newCharOccurence.occurrence++;
    }
  }
  list.push_back(newCharOccurence);
  printCharOccurenceVector(list);
  return 0;
}