C 语言 习题 1-12

练习 1-12 编写一个程序，以每行一个单词的形式打印其输入。

 #include <stdio.h>

 #define IN 1
 #define OUT 0

 int main(int argc, char const *argv[])
 {
     int c, state;

     state = OUT;

     while ((c = getchar()) != EOF) {
         if (c == '\n' || c == ' ' || c == '\t') {
             if (state == IN) {
                 putchar('\n');
                 state = OUT;
             }
         }
         else if (state == OUT) {
             state = IN;
             putchar(c);
         }
         else
             putchar(c);
     }

     return ;
 }