用C程序编程：判断一个正数是否是同构数

#include<stdio.h>
int main()
{ int n,temp,k;
printf("please input the value of n: ");
scanf("%d",&n);
k=n*n;
temp=k-n;
if(temp%10==0)
printf("%d is tong gou shu\n",n);
else
printf("%d is not tong gou shu\n",n);
return 0;
}

看看这个

for(i=1;i<1000;i++)
{
if((i*i)%10==i)
printf("%d\n",i);
}

看看有问题没有！请指教！
#include<stdio.h>
int istg(int n);
main(){
int n;
printf("Enter a Number: ");
scanf("%d",&n);
printr("\n%d is %s a TongGou Shu!\n",n,istg(n)?"":"not");
return 0;
}

int istg(int n){
int tn;
long right_n=0,sq_n;
sq_n=n*n;
while(right_n<n){
tn=sq_n%10;
sp_n/=10;
right_n+=tn;
}
if( right_n==n) return