pe 7-5.txt

c primer 部分习题答案

#include <stdio.h>
 
int main(void)    
{
     char ch;
     int ct1 = 0;
     int ct2 = 0;
     
     while ((ch = getchar()) != '#')
     {
         switch(ch)
         {
              case '.'    :  putchar('!');
                             ++ct1;
                             break;
 
              case '!'    :  putchar('!');
                             putchar('!');
                             ++ct2;
                             break;
             default    :    putchar(ch);
         }
     }
     printf("%d replacements of . with !\n", ct1);
     printf("%d replacements of ! with !!\n", ct2);
      
    return 0;
}