【补充】题目: 编写一个C函数,将”I am from shanghai ”倒置为”shanghai from am I”,及将句子中的单词位置倒置,而不改变单词内部结构.

来源：互联网发布：阿里云虚拟主机 jsp 编辑：程序博客网时间：2024/05/21 18:36

方法一：

#include <stdio.h>#include <stdlib.h>#include <string.h>void my_strcpy(char *result,char *str,int len)               //复制长度为len的字符串{while(len){*result = *str;str++;result++;len--;}}void change(char *str,char **a){int i = 0;                   //记录行数int j = 0;int count = 0;               //记录每行元素的个素char *temp = NULL;temp = (char*)malloc(sizeof(char));while(*str){if(*str == ' '||*str == '\0'){my_strcpy(a[i],str-count,count);i++;count = 0;}count++;str++;}if(*str == '\0'){my_strcpy(a[i],str-count,count);count = 0;i++;}for(j = 0;j < i/2;j++){strcpy(temp,a[j]);strcpy(a[j],a[i-j-1]);strcpy(a[i-j-1],temp);}for(j = 0;j < i;j++){printf("%s ",a[j]);}printf("\n");free(temp);}int main(){int i = 0;char str[] = "I am from shanghai";char *a[4] = {0};for(i = 0;i < 4;i++){a[i] = (char*)malloc(sizeof(char)*20);}change(str,a);for(i = 0;i < 4;i++){free(a[i]);}return 0;}

方法二：

#include <stdio.h>#include <string.h>void change(char *str){char temp;char *p = str;char *start = str;char *end = str;while(*p != '\0'){p++;end++;}end = p-1;p = str;while(*p!='\0'){while(start < end){temp = *start;*start = *end;*end = temp;start++;end--;}p++;}}void change1(char *str){char *p = str;char *start = p;char *end = p;char temp;while(*p != '\0'){if(*p ==' '||*p == '\0'){end = p-1;while(start < end){temp = *start;*start = *end;*end = temp;start++;end--;}start = end = p+1;}p++;}end = p-1;while(start < end){temp = *start;*start = *end;*end = temp;start++;end--;}}int main(){char str[100];printf("please input string:\n");gets(str);change(str);change1(str);printf("the result is :%s\n",str);}

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