【C语言实现倒置字符串（例如：I like beijing.打印成：beijing.like I）】
倒置字符串
思路
1 .先整体倒置 I like beijing 倒置后 gnijieb ekil i
2，逐个单词倒置 beijing like i
文章目录
- 技能点
- 代码实现
- 总结
技能点
1：指针的使用 2：gets和scanf的区别
1.指针的使用：
char a[100] 表示定义一个数组，开辟100个连续的内存空间 。其中数组名为a
a 表示数组首元素的地址 *start=&a, start 表示指向数组a的指针 *start表示数组的第一个元素，这里是 I
2:gets和scanf的区别
gets
Get a line from the stdin stream
头文件为
| gets | scanf |
|---|---|
| Get a line from the stdin stream | Read formatted data from the standard input stream |
| 头文件 | |
| char *gets( char *buffer ); | int scanf( const char *format [,argument]… ) |
| Return Value Each of these functions returns its argument if successful. A NULL pointer indicates an error or end-of-file condition. Use ferror or feof to determine which one has occurred. | Return Value Both scanf and wscanf return the number of fields successfully converted and assigned; the return value does not include fields that were read but not assigned. A return value of 0 indicates that no fields were assigned. The return value is EOF for an error or if the end-of-file character or the end-of-string character is encountered in the first attempt to read a character. |
代码实现
# define _CRT_SECURE_NO_WARNINGS 1// 把 I LOVE YOU 改写成 YOU LOVE I#include //逆序函数，只要传入首位字符的位置就可以实现逆序void reverse(char* left ,char *right ){//一次翻转while (left < right){char tem = *left;*left = *right;*right = tem;left++;right--;}}void reverse_string(char* a){reverse(a, a+strlen(a)-1);//2.先整体逆序//2.每个单词逆序while (*a){//单词逆序char* start = a;char* end = a;while (*end != ' ' && *end != '\0'){end++;//指针++，指向下一个位置}//结束上述循环时end指向空格或者\0reverse(start, end - 1);//传参时指针//下一个单词的逆序if (*end != '\0')//如果不是最后一个单词,则 end+1作为新一个单词的开头{a = end + 1;//空格后面的一个}else//是最后一个单词{ a= end;}}}int main(){char a[100] = { 0 };gets(a);//输入一个字符串reverse_string(a);printf("%s", a);return 0;}总结
以上就是今天要讲的内容，本文用一个例题简单介绍了指针的使用，欢迎指正交流。
