[语言过关]位数互换

<p style="font-family:'Microsoft Yahei';font-size:14px;background-color:#F5F5F5;"> change.pas/c/cpp </p> <p style="font-family:'Microsoft Yahei';font-size:14px;background-color:#F5F5F5;"> 输入一items4位数，要求把这items数倒着输出。 </p> <h3 style="font-family:'Microsoft Yahei';background-color:#F5F5F5;"> 输入格式 </h3> <p style="font-family:'Microsoft Yahei';font-size:14px;background-color:#F5F5F5;"> 只有一行，为一items4位的正整数（保证各位不是零） </p> <h3 style="font-family:'Microsoft Yahei';background-color:#F5F5F5;"> 输出 </h3> <p style="font-family:'Microsoft Yahei';font-size:14px;background-color:#F5F5F5;"> 只有一行 </p> <h3 style="font-family:'Microsoft Yahei';background-color:#F5F5F5;"> 样例输入 </h3> <p style="font-family:'Microsoft Yahei';font-size:14px;background-color:#F5F5F5;"> <span style="font-family:'Lucida Console';">1234</span> </p> <h3 style="font-family:'Microsoft Yahei';background-color:#F5F5F5;"> 样例输出 </h3> <p style="font-family:'Microsoft Yahei';font-size:14px;background-color:#F5F5F5;"> <span style="font-family:'Lucida Console';">4321</span> </p>