C程序设计语言习题（1-12）

统计行数、单词数，字符数的程序：

 #include<stdio.h>

 #define IN    1   /*在单词内*/
 #define OUT   0   /*在单词外*/

 int main()
 {
     int c, nl, nw, nc, state;

     state = OUT;
     nl = nw = nc  = ;    //nl：行数  nw：单词数  nc：字符数
     while((c = getchar()) != EOF) {
         ++nc;
         if(c == '\n')
             ++nl;
         if(c == ' ' || c == '\n' || c == '\t')
             state = OUT;
         else if (state == OUT) {
             state = IN;
             ++nw;
         }
     }
     printf("%d %d %d\n", nl, nw, nc);
     return ;
 }  

【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   /*在单词内*/
 #define OUT   0   /*在单词外*/

 int main()
 {
     int c, state;
     state = OUT;

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