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  = 0;    //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 0;
}  

【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 0;
}