问题描述

这段代码什么意思求解释

#include
#include
#include
#include

//Constants
#define LINELENGTH 100

// Function prototypes
void reverse_words(char* words[], char* rwords[], int count);
void print_words(char* words[]);
int mark_words(char* line, char* words[]);

// Main Function
int main( void )
{
char *line;
char *words[51];
char *rwords[51];
int count;

if(( line = (char*) malloc(LINELENGTH * sizeof(char))) == NULL ) {
return 1;
}
strcpy(line, "this is a sample line to be broken into words.");

count = mark_words( line, words );

reverse_words( words, rwords, count );

print_words( rwords );

return 0;
}

/*
Converts line to a packed string of words and puts
pointers to each word in words[].

returns the number of words it found.
/
int mark_words( char line, char* words[] )
{
int i, count = 1;
char inbetween = 0;

words[0] = line;
for( i=0; line[i] != 0 ; ++i ) {
if( isspace( line[i] )) {
inbetween = 1;
line[i] = '';
}
else { // i.e. line[i] is not a whitespace character
if( inbetween ) {
inbetween = 0;
words[count++] = line + i;
}
}
}
words[count] = NULL;
return count;
}

/*
Copies the pointers in words[] to rwords[] in reverse order.
count is the number of pointers in words[]
/
void reverse_words( char words[], char* rwords[], int count )
{
int j = 0;

for( j = 0; words[j] != ''; j++ ) {
rwords[j] = words[count-j-1];
}
rwords[j] = '';
}

/*
Prints each word in words[] to stdout in order and preceded by its number.
/
void print_words( char words[] )
{
int k;

for( k=0; words[k] != 1; k++ ) {
printf("%2d. %s
", k+1, words[k]);
}
}

解决方案

int mark_words(char* line, char* words[]);
主要的用途是，把一行的单词按空格分开，每个单词的字符串指针放到words数组里面，并返回单词个数

void print_words(char* words[]);
打印words数组中每一个单词

void reverse_words(char* words[], char* rwords[], int count);
把words数组中的单词按逆序反过来，放到rwords数组中

测试是
this is a sample line to be broken into words.

输出结果是

1. words.
2. into
3. broken
4. be
5. to
6. line
7. sample
8. a
9. is
   1. this

解决方案二：

关于这段奇怪代码的解释

解决方案三：

代码错误很多，我实在无聊，帮你改好了

 #include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <ctype.h>

//Constants
#define LINELENGTH 100

// Function prototypes
void reverse_words(char* words[], char* rwords[], int count);
void print_words(char* words[] , int count);
int mark_words(char* line, char* words[]);

// Main Function
int main( void )
{
    char *line;
    char *words[51];
    char *rwords[51];
    int count;

    if(( line = (char*) malloc(LINELENGTH * sizeof(char))) == NULL ) {
        return 1;
    }
    strcpy(line, "this is a sample line to be broken into words.");

    count = mark_words( line, words );

    reverse_words( words, rwords, count );

    print_words( rwords , count );
    getchar();
    return 0;
}
/*
   Converts line to a packed string of words and puts
   pointers to each word in words[].

   returns the number of words it found.
   */
int mark_words( char* line, char* words[] )
{
    int i, count = 1;
    char inbetween = 0;

    words[0] = line;
    for( i=0; line[i] != 0 ; ++i ) {
        if( isspace( line[i] )) {
            inbetween = 1;
            line[i] = '';
        }
        else { // i.e. line[i] is not a whitespace character
            if( inbetween ) {
                inbetween = 0;
                words[count++] = line + i;
            }
        }
    }
    words[count] = NULL;
    return count;
}
/*
   Copies the pointers in words[] to rwords[] in reverse order.
   count is the number of pointers in words[]
   */
void reverse_words( char* words[], char* rwords[], int count )
{
    int j = 0;

    for( j = 0; words[j] != ''; j++ ) {
        rwords[j] = words[count-j-1];
    }
    rwords[j] = '';
}

/*
   Prints each word in words[] to stdout in order and preceded by its number.
   */
void print_words( char* words[] , int count)
{
    int k;

    for( k=0; k < count; k++ ) {
        printf("%2d. %s
", k+1, words[k]);
    }
}