#include<stdio.h>
int main(){
	int Reverse(int x);
	int x;
	printf("请输入一个整数：");
	scanf("%d",&x);
	printf("逆序数为：%d",Reverse(x));
	return 0;
}

int Reverse(int x){	
	int rev=0;
	while(x!=0) {	//以x=123为例 ,纵向读 
		rev*=10;	//rev=0		*	rev=30 		*	rev=320			*
		rev+=x%10;	//rev=0+3=3	*	rev=30+2=32	*	rev=320+1=321	*
		x/=10;		//x=12 		*	x=1			*	x=0				*
	}
	return rev;
}