编写程序颠倒句子中单词的顺序

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Enter a sentece: you can cage a swallow can't you? （下划线为用户输入的字符）

Reversal of sentence: you can't swallow a cage can you?

#include 
using namespace std;
#define M 10
#define N 20
void calc(){
	char* str = "you can cage a swallow can't you?";
	cout<<"input:"<0;i--){
		cout<