C语言统计程序实例

// wordcnt.c -- counts characters, words, lines
#include <stdio.h>
#include <ctype.h>         // for isspace()
#include <stdbool.h>       // for bool, true, false
#define STOP '|'
int main(void)
{
    char c;                 // read in character
    char prev;              // previous character read
    long n_chars = 0L;      // number of characters
    int n_lines = 0;        // number of lines
    int n_words = 0;        // number of words
    int p_lines = 0;        // number of partial lines
    bool inword = false;    // == true if c is in a word

    printf("Enter text to be analyzed (| to terminate):\n");
    prev = '\n';            // used to identify complete lines
    while ((c = getchar()) != STOP)
    {
        n_chars++;          // count characters
        if (c == '\n')
            n_lines++;      // count lines
        if (!isspace(c) && !inword)
        {
            inword = true;  // starting a new word
            n_words++;      // count word
        }
        if (isspace(c) && inword)
            inword = false; // reached end of word
        prev = c;           // save character value
    }

    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;
}