7744问题

代码：

1、

# include <stdio.h>

int main()

{

int x,n,hi,lo;

for(x = 1;;x++)

{

n = x * x;

if(n < 100)

continue;

if(n > 9999)

break;

hi = n / 100;

lo = n % 100;

if(hi / 10 == hi % 10 && lo /10 == lo % 10)

printf("%d\n",n);

}

return 0;

}

2、

# include <stdio.h>

# include <math.h>

int main()

{

int a,b,n;

double m;

for(a = 1; a <= 9; a++)

for(b = 0; b <= 9; b++)

{

n = a * 1100 + b *11;

m = sqrt(n);

if(floor(m+0.5) == m)

printf("%d\n",n);

}

return 0;

}