UNIX 系统中 wc 程序的主要部分

以下代码为 UNIX 系统中 wc 程序的骨干部分

 #include <stdio.h>

 #define IN 1

 #define OUT 0

 int main(int argc, char const *argv[])

 {

     int c, nl, nw, nc, state;

     state = OUT;

     nl = nw = nc = ;

     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 ;

 }