#include<stdio.h>
main()
{
int dem,tg,sum=0,max=0;
long n,i;
do
{
printf("nhap vao so n nho hon 2 ti: ");
scanf("%ld",&n);
if(n>=2000000000)
printf("o tao bao nhap nho hon 2 ti ma! nhap lai ngay!\n");
}
while(n>=2000000000);
for(i=0; i<=n; i++)
if(n==i*i)
dem=1;
if(dem==1)
{
printf("%d la so chinh phuong\n",n);
tg=n;
while(tg>0)
{
sum+=tg%10;
tg/=10;
}
printf("tong cac chu so cua %d la %d",n,sum);
}
else
{
printf("%d khong phai la so chinh phuong\n",n);
tg=n;
while(tg>0)
{
i=tg%10;
if(i>max)
max=i;
tg/=10;
}
printf("chu so lon nhat cua %d la %d",n,max);
}
return 0;
}
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