输入一个正整数，以逆序输出其各位数字.(c语言程序怎么写)

#include <stdio.h>

int main(void)
{
int n;
scanf("%d",&n);
getchar();
int num = 0;
while(n !=0)
{
num *= 10;
num += (n%10);
n = n/10;
}
printf("%d",num);
getchar();
return 0;
}

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

int n = 123;
char str[256];
sprintf(str, "%d", n);
int len = strlen(str);
for(int i = len - 1; i >= 0; i--)
printf("%c", str[i]);
printf("\n");