C :

/*
 * =====================================================================================
 *
 *       Filename:  902-3.c
 *
 *    Description:  ihahah
 *
 *        Version:  1.0
 *        Created:  2013/9/3 0:32:01
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  mdk-vim.cpp-c (mdk), mengdaikun@gmail.com
 *        Company:  cjluacm-vim-mdk
 *
 * =====================================================================================
 */
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

char s[1001];
 
void reverse(int begin,int end)
{
    while(begin<end)
    {
        char temp=s[begin];
        s[begin]=s[end];
        s[end]=temp;
        ++begin;
        --end;
    }
}
 
int main()
{
    //freopen("a.in","r",stdin);
    
    while(gets(s))
    {
        int len=strlen(s),begin=0;
        
        reverse(0,len-1);
        
        int i;

        for(i=0;i<len;i++)
        {
            if(s[i]!=' ')
            {
                if(i>0&&s[i-1]==' ')
                    begin=i;
                else if(i<len-1&&s[i+1]==' ' || i==len-1)
                    reverse(begin,i);
            }
        }
        
        printf("%s\n",s);
    }
    return 0;
}
 

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);
		while(cin.hasNext())
		{
			String str = cin.nextLine();
			revString(str);
		}
	}
	
	public static String revString(String str)
	{
		StringBuilder builder = new StringBuilder();
		builder.append("begin ");
		builder.append(str);
		builder.append(" end");
		String []subStrings = builder.toString().split(" ");
		for(int i= subStrings.length -2 ;i>=2;i-- ){
			System.out.print(subStrings[i]+" ");
		}
		System.out.println(subStrings[1]);
		return null;
	}

}