程序代码：

#include<stdio.h>
#include<ctype.h>
#include<stdbool.h>
#define STOP '|'

int main()
{
    char c;
    char prev;
    long n_chars = 0L;                //字符数
    int n_lines = 0;                //行数
    int n_words = 0;                //单词数
    int p_lines = 0;                //不完整的行数
    bool inword = false;            //如果c在单词中，inword等于true

    printf("Enter text to be analyzed(| to terminare):\n");
    prev = '\n';                    //用于识别完整的行
    while ((c = getchar()) != STOP);
    {
        n_chars++;                    //统计字符
        if (c=='\n')
            n_lines++;                //统计行
        if (!isspace(c) && !inword)
        {
            inword = true;            //开始一个新的单词
            n_words++;                //统计单词
        }
        if (isspace(c) && inword)
            inword = false;            //打到单词末尾
        prev = c;                    //保存字符的值
    }
    if (prev != '\n')
        p_lines = 1;
    printf("characters=%ld,words=%d,lines=%d,",
        n_chars, n_words, n_lines);
    printf("partial lines =%d\n", p_lines);
    
    return 0;
}