// ex_ch7_5.c
#include <stdio.h>

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

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

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