The sample output aabb's four complete square numbers (the first two digits are the same, the last two digits are the same)

Example: Output the four-digit complete square number of aabb (the first two digits are the same, the last two digits are the same)

Must pay attention to the way of thinking:

• Square root (but will produce errors)

#include<stdio.h>
#include<math.h>
using namespace std;
int main()
{
	int a;
	int b;
	for (int i = 1; i < 9; i++)
	{
		for (int j = 0; j < 9; j++)
		{
			int n = i * 1100 + j * 11;
			int m = floor(sqrt(n) + .5);//要避免误差的影响(比如 ,经过大量运算之后,由于误差,1变成了0.99999);---->此处在消除误差;
			if (m * m == n)printf("%d", n);
		}
}
}

• Avoid square root:

#include<stdio.h>
#include<math.h>
using namespace std;
int main()
{
	for (int i = 1;; i++)
	//此处可以从32开始数,因为之前的数都不足四位;
	{
		int n = i * i;
		if (n < 1000)continue;
		if (n > 9999)break;
		int a = n / 100;
		int b = n % 100;
		if (a % 10 == a / 10 && b % 10 == b / 10)printf("%d", n);
	}


}