c - 不使用 sting 库交换字符串的单词并使用指针

Question

我锻炼的目标是产出

原始字符串是:

沉默是一只正在寻找的鸟:转向；边缘，生命的边缘。 e. e.卡明斯

交换后的目标字符串:卡明斯 e. e.生活。边缘、车削；鸟:看着.就是沉默

我得到的是:

69原始字符串是:沉默是一只正在寻找的鸟:转身；边缘，生命的边缘。 e. e.卡明斯

交换后的目标字符串:

我的代码:'''

#include<stdio.h>
#include<stdlib.h>
#define MAX_STR_LEN 1024
// DO NOT USE the string library <string.h> for this exercise
void wordSwapper(char *source, char *destination)
{  
    int count = 0;
    while (*(source + count) != '\0')
    {
        count++;
    }
    printf("%d", count);
    for(int i = 0; i < count; i++) 
    {
        *(destination + i) = *(source + (count - i));
    }
}

int main()
{    
    char source[MAX_STR_LEN]="silence .is a looking bird:the turning; edge, of life. e. e. cummings";    
    char destination[MAX_STR_LEN]="I am a destination string and I contain lots of junk 1234517265716572@qsajdkuhasdgsahiehwjauhiuiuhdsj!"; 
    wordSwapper(&source[0], &destination[0]);   
    printf("The original string is: \n%s\n",source);    
    printf("Destination string after swapping: \n%s\n",destination);    
}

'''

Answer 1

我的变体:

void wordSwapper(char *source, char *destination)
{  
    char *start, *end;

    start = source;
    while (*(start++) != '\0')
        destination++;

    // write trailing zero
    *destination = '\0';

    while (*source != '\0')
    {
        // copy spaces
        while (*source == ' ')
            *(--destination) = *(source++);

        // find word bounds
        start = end = source;
        while (*end != '\0' && *end != ' ')
            end++;

        source = end;

        // copy word
        while (end > start)
            *(--destination) = *(--end);
    }
}