C++ Primer 5th Edition code (1.4.4)

[JQP]

Hi, I'm a complete noob to programming. I'm working my way through C++ Primer, 5th edition*. I have understood the examples so far, as well as worked through their exercises, but this one from 1.4.4 (Flow of Control - The "If" Statement) has me stumped:

#include "stdafx.h"
#include <iostream>
int main()
{
	// currVal is the number we're counting; we'll read new values into val
	int currVal = 0, val = 0;
	// read first number and ensure that we have data to process
	if (std::cin >> currVal) 
	{
		int cnt = 1;  // store the count for the current value we're processing
		while (std::cin >> val) 
		{ // read the remaining numbers
			if (val == currVal)  // if the values are the same
				++cnt;  // add 1 to cnt
			else 
			{ // otherwise, print the count for the previous value
				std::cout << currVal << " occurs "
					<< cnt << " times" << std::endl;
				currVal = val;  // remember the new value
				cnt = 1;  // reset the counter
			}
		}  // while loop ends here
		// remember to print the count for the last value in the file
		std::cout << currVal << " occurs "
			<< cnt << " times" << std::endl;
	} // outermost if statement ends here
	return 0;
	}

Thing is, this code doesn't seem to work as intended. If I enter enough values, it breaks (stops counting values), and I don't understand why. I kinda prefer that I know how a program is expected to work before I dive into figuring out the code.

*Yes, I know most people recommend starting with a language simpler than C++.

ETA: judging by the exercises that follow, the authors intended this:

Exercises Section 1.4.4
Exercise1.17:What happens in the program presented in this section if the
input values are all equal? What if there are no duplicated values?
Exercise1.18:Compile and run the program from this section giving it only
equal values as input. Run it again giving it values in which no number is
repeated.

[yR9wb7Xj]

I would tell you what helps, but you're pm is disable if you could enable it.

[JQP]

K PMs are enabled.

[NubGurl97]

@Alpha22, hi can you please help me too? I'm literally in the same boat as @JQP lol.

[MiiNiPaa]

How much is "enough"? Can you post example of series allowing to reproduce your problem?