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输入一行字符串，把字符串翻转 。

#include 
   
    #include 
    
     #include 
     
      void reverse(char *str, int beg, int end){
   	for (int i = beg , j = end; i < j; ++i, --j)	{
   		char tmp = str[i];		str[i] = str[j];		str[j] = tmp;	}}int main(){
   	char str[100];	while (memset(str, 0, sizeof(str)), fgets(str, sizeof(str), stdin) != NULL)	{
   		str[strlen(str) - 1] = '\0';        //fgets去掉换行		reverse(str, 0, strlen(str) - 1);		int wordBeg = 0;		int wordEnd;		while (1)		{
   			while (str[wordBeg] == ' ')  			{
   				++wordBeg;			}			if (wordBeg >= strlen(str)) 			{
   				break;			}			wordEnd = wordBeg; 			while (str[wordEnd + 1] != ' ' && str[wordEnd + 1] != '\0')			{
   				++wordEnd;			}			reverse(str, wordBeg, wordEnd);			if (str[wordEnd + 1] == '\0')			{
   				break;			}			else			{
   				wordBeg = wordEnd + 1;			}		}				puts(str);	}}
     
    
   

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