练习 1 - 12 编写一个程序，以每行一个单词的形式打印其输出。
/* ex12.c */
#include <stdio.h>
#define IN 1
#define OUT 0
int main() {
int c;
int inword = OUT;
while ((c = getchar()) != EOF) {
if (c == ' ' || c == '\n' || c == '\t') {
if (inword) {
putchar('\n');
inword = OUT;
}
} else {
putchar(c);
inword = IN;
}
}
return 0;
}
编译运行结果：
$ ./ex12.out
april is a dog's dream
april
is
a
dog's
dream
$
