, , 25 (25 * 25 = 6 25).
#include <iostream>
#include <iomanip>
#include <math.h>
#include <conio.h>
#include <windows.h>
using namespace std;
bool Automorfnoe(long n)
{
long copy = n; // n
long m = 1; /* m, 10, n, 25 m = 100 */
do
{
m *= 10;
copy /= 10;
} while(copy);
if ((n*n % m) == n) /* n m , n, , c n , */
return true;
else return false;
}
int main()
{
if(SetConsoleCP(1251)==0
{
cerr<<"Fialed to set codepage!"<<endl;
}
if(SetConsoleOutputCP(1251)==0)
{
cerr<<"Failed to set OUTPUT page!"<<endl;
}
do
{
long m;
cout<< " ";
cin>> m;
// n, m:
long n = m+1; //
bool flag = true;
while (!Automorfnoe(n)) //
{
n++; //
if (n > 1e5) { flag = FALSE; break;}
/* , , */
}
if (flag) // , true, ,
cout<< " - " << n << ": " << n <<" = " << n * n << endl;
else cout<< " \n";
} while (_getch()!= 27);
return 0;
}
5. y= ax+b y = c/x +d
( )
:
a 0, , .
#include <iostream>
#include <iomanip>
#include <math.h>
#include <conio.h>
#include <windows.h>
using namespace std;
/* Root(), , : */
void Root(double a, double b, double c, double& x1, double& x2, byte& k);
void Root(double a, double b, double& x, byte& k);
//
int main()
{
if(SetConsoleCP(1251)==0)
//
{
cerr<<"Fialed to set codepage!"<<endl;
}
if(SetConsoleOutputCP(1251)==0)
{
cerr<<"Failed to set OUTPUT page!"<<endl;
}
double a, b, c, d;
double x1, y1, x2, y2;
|
|
|
byte k; //
do
{
cout<< " a b c d ";
cin>> a >> b >> c >> d;
if (a) // 0,
Root(a, b-d, -c, x1, x2, k);
//
else // :
Root(b-d, -c, x1, k);
// k :
switch(k)
{
case 3: cout<< " \n"; break;
case 2: y1 = a*x1 + b; y2 = a*x2 + b;
cout<<" 2 : " <<setprecision(2)<< x1 << ',' << y1 << " " << x2 << ',' << y2 << endl; break;
case 1: y1 = a*x1+ b;
cout<<" "<<setprecision(2)<< x1 << ',' << y1 << endl; break;
default: cout<<" \n";
}
} while (_getch()!= 27);
return 0;
}
//
void Root(double a, double b, double c, double& x1, double& x2, byte& k)
{
double d = b*b - 4*a*c;
if (d > 0)
{
k = 2;
x1 = (-b + sqrt(d)) / (2*a);
x2 = (-b - sqrt(d)) / (2*a);
if (x1==0 || x2 == 0) k = 1;
// x
if (x1 == 0) x1 = x2; /* , x1 */
}
else if (d == 0)
{
x1 = -b / (2*a);
k = 1;
if (x1 == 0) k = 0;
}
else k = 0;
}
//
void Root(double a, double b, double& x, byte& k)
{
if (a)
{
k = 1;
x = -b / a;
if (x == 0) k = 0;
}
else if (b) k = 0;
else k = 3;
}
