// ex_ch7_4.c
#include <stdio.h>

int main(void)
{
	char ch;
	int subst = 0;

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

	while ((ch = getchar()) != '#')
	{
		if (ch == '.')
		{
			printf("!");
			subst++;
		}
		else if (ch == '!')
		{
			printf("!!");
			subst++;
		}
		else
		{
			printf("%c", ch);
		}
	}
	printf("Number of substitutions made: %d\n", subst);
	return 0;
}