C语言基础问题,急急急

#include<stdio.h>
int main()
{
int number,i;
scanf("%d",&number);
while(i)
{
i=number%10;
number=number/10;
printf("%d",i);
}
printf("\n");
return 0;
}

#include<iostream.h>
void main(void)
{
int i,n;
cin>>n;
for(i=n;i!=0;i=i/10)
cout<<i%10;
cout<<endl;
}