//author@ Jolex Del Pilar
//Implementing ATOI in C++

#include <iostream>

using namespace std;

int myAtoi(char * pStr); //Prototype
int strLength(char * pStr); //Find the length of the passed string

int main() {
	
	char * testInput;

	testInput = "-1a2v5h+4";

	cout << "Value: " << myAtoi(testInput) << endl;
	cout << "String Length: " << strLength(testInput) << endl;

}
int myAtoi(char * pStr)
{
	int ret_value = 0; //Store the value
	int i; //for loop counter
	int temp; //Holder for number

	//Check if NULL string passed
	if ( NULL == pStr ) {
		return 0;
	}

	//int len = strlen(pStr)-1; //Length of the string being passed (using STL)
	int len = strLength(pStr); //Length of the string being passed

	for(i = 0; i <= len; i++)
	{
		if ( (pStr[i] >= '0')&&(pStr[i] <= '9') ) //We only want digits 0-9, nothing else...
		{
			temp = ( pStr[i]-'0' ); //Converting an ASCII numeric character to its internal(integral). '9' - '0' == 9

			ret_value = ret_value*10 + temp; //Enlarge the number by *10 every time
		}
	}
	return ret_value;
}
int strLength(char * pStr) {
	int inc;
	int lenCount = 0;
	for(inc = 0; pStr[inc] != NULL; inc++)
	{
		lenCount++;
	}
	return lenCount;
}