C++の授業(int)charの自前実装

CharToInt.cpp

int charsToInt(const char[] chars){
	int ret = 0;//返り値
	int digits = chars.size()-1;//桁
	for(int i = 0; i < digits; i++){
		int num = charToInt(chars[i]);
		ret += number * pow(10,i);
	}
	return ret;
}

int charToInt(const char c){
	return c - '0';
}

Prac06_2.cpp

#include <iostream>
using namespace std;

void printMonths(const char *months[]){
	int size = months.size();
	for(int i = 0; i < size; i++){
		cout << month[i] << " ";
	}
	cout << endl;	
}

void count(const char *months[], const char c){
	int size = months.size();
	for(int i = 0; i < size; i++){
		cout << month[i] << ":";
		int count = 0;
		int textLength = months[i].size();
		for(int j = 0; j < textLength-1; j++){
			count += months[i][j] == c;
		}
		cout << count << endl;
	}
}

int main(){
	const char *months[] = {
		"January", "February", "March", "April",
		"May", "June", "July", "August", "September",
		"October", "November", "December"};
		
	cout << "***All months***" << endl;
	printMonths(months);
	cout << "***How many 'e's?***" << endl;
	count(months, 'e');
	cout << "***How many 'r's?***" << endl;
	count(months, 'r');
		
	return 0;
}

size()は使えないのでヌル文字'\0'まで探索して要素数をカウントする関数が必要になるので要修正