// ex_ch7_6.c
#include <stdio.h>

int main(void)
{
	char ch, prev_ch;
	int ei_occured = 0;

	printf("Enter characters, use # to end.\n");

	while ((ch = getchar()) != '#')
	{
		if (ch == 'i')
		{
			if (prev_ch == 'e')
			{
				ei_occured++;
			}
		}
		prev_ch = ch;
	}
	printf("Number of ei found: %d\n", ei_occured);
	return 0;
}