having trouble using ch[]

[Modern Man19]

I came up with this code to try to add each number from a zip code inputted by the user but I think I'm adding up the ascii values not the real values the user is inputting. How I can go from ascii to the real digit. This is my code so far

#include <iostream> 
#include <iomanip>
#include <string> 
#include <conio.h> 
using namespace std; 

int main()
{ 
	int total = 0; 
	char ch[5];

	cout << "Please input your 5 digit zip code: "; 
	for (int i=0; i<5; i++)
{
	ch[i] = getch();
	total = total + ch[i];
	cout << ch[i];
}
	cout << endl;
	cout << total << endl;
	
	








return 0;
}

[Kikiman]

cout << "Please input your 5 digit zip code: ";

You want to input ascii values?

int temp;

for (int i=0; i<5; i++)
{
	cin >> temp;
        ch[i] = temp;
	total = total + ch[i];
	cout << ch[i];
}

[Modern Man19]

no I want the user to input something like 92010 and add all those numbers up and make up a bar code like the mailing system

[Kikiman]

Oh, sorry. Is it what you need?

for (int i=0; i<5; i++)
{
	ch[i] = getche(); // It's equivalent to cout<< (char)getch(); 
	total = total + (ch[i] - '0'); // real digit value
}

[Modern Man19]

Yes that's perfect man! thank you so much. but I just have one more question. why do you subtract ch[i] from 0.