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 ;
 }