C++高手幫小弟解決哈C++求回數的數據溢出問題，附源碼

#include<iostream>

using namespace std;

int pal(int n);

void main(void)

{

int a;

scanf("%d",&a);

printf("%d",pal(a));

}

int pal(int n)

{

char *a=(char *)malloc(20);;

sprintf(a,"%d",n);

a=strrev(a);

sscanf(a,"%d",&n);

free(a);

return n;

}