C 语言 习题 1-12

 1 #include <stdio.h>
 2 
 3 #define IN 1
 4 #define OUT 0
 5 
 6 int main(int argc, char const *argv[])
 7 {
 8     int c, state;
 9 
10     state = OUT;
11 
12     while ((c = getchar()) != EOF) {
13         if (c == 'n' || c == ' ' || c == 't') {
14             if (state == IN) {
15                 putchar('n');
16                 state = OUT;
17             }
18         }
19         else if (state == OUT) {
20             state = IN;
21             putchar(c);
22         }
23         else
24             putchar(c);
25     }
26 
27     return 0;
28 }