C语言程序设计，初级的~设计算法输入一个四位正整数，将它们倒排，例如输入1234，输出4321

C语言程序设计，输入一个四位正整数，将它们倒排输出的算法如下：

#include 

#include 

int main()

{

int oldnum;

int newnum=0;

int temp;

printf("please input number\n");

scanf("%d",&oldnum);

printf("the old number is %d\n",oldnum);

while (oldnum !=0)

{

newnum = newnum*10+oldnum%10;

oldnum = oldnum/10;

}

printf("the change number is %d",newnum);

getch();

return 0;

};