7.12.5

7.12.4

include <stdio.h>

int main(void)
{
int Exclamationtoperiod = 0;
int two2one = 0;
char ch;

while ((ch = getchar()) != '#')
{
switch (ch)
{
case '.':
putchar('!');
++Exclamationtoperiod;
break;
case '!':
putchar('!');
putchar('!');
++two2one;
break;
default:
putchar(ch);
}
}

printf("\n替换了%d次\n", two2one + Exclamationtoperiod);

return 0;
}