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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. class polynominal {
  5.     int a,b,c;
  6.     public:
  7.     polynominal(int a,int b,int c) : a(a),b(b),c(c) {}
  8.     void Write() {//перший метод
  9.         if ((b>=0) and (c>=0)) {
  10.             cout<<a<<"x²+"<<b<<"x+"<<c<<endl;
  11.         }
  12.         else {
  13.         	if ((b<0) and (c>=0)) {
  14.         		cout<<a<<"x²"<<b<<"x+"<<c<<endl;
  15.         	}
  16.         	else {
  17.         		if ((b>=0) and (c<0)) {
  18.         			cout<<a<<"x²+"<<b<<"x"<<c<<endl;
  19.         		}
  20.         		else {
  21.         			cout<<a<<"x²"<<b<<"x"<<c<<endl;
  22.         		}
  23.         	}
  24.         }
  25.     }
  26.     double Solve() {//другий метод
  27.     	if ((b*b<=4*a*c) or (a==0)) {
  28.     		cout<<"no real solution"<<endl;
  29.     		return 0;
  30.     	}
  31.     	else {
  32.     		double x,y;
  33.     		x=(-b+sqrt(b*b-4*a*c))/(2*a);
  34.     		cout<<x<<endl;
  35.     		y=(-b-sqrt(b*b-4*a*c))/(2*a);
  36.     		cout<<y<<endl;
  37.     		return x;
  38.     	}
  39.     }
  40.     void form() {//третій метод
  41.     	if ((b*b<=4*a*c) or (a==0)) {
  42.     		cout<<"cannot form because no real roots"<<endl;
  43.     	}
  44.     	else {
  45.     		double x,y;
  46.     		x=(-b+sqrt(b*b-4*a*c))/(2*a);
  47.     		y=(-b-sqrt(b*b-4*a*c))/(2*a);
  48.     		if ((x>=0) and (y>=0)) {
  49.     		    cout<<a<<"(x-"<<x<<")(x-"<<y<<")"<<endl;
  50.     		}
  51.     		else {
  52.     			if ((x<0) and (y>=0)) {
  53.     				cout<<a<<"(x+"<<abs(x)<<")(x-"<<y<<")"<<endl;
  54.     			}
  55.     			else {
  56.     				if ((x>=0) and (y<0)) {
  57.     					cout<<a<<"(x-"<<x<<")(x+"<<abs(y)<<")"<<endl;
  58.     				}
  59.     				else {
  60.     					cout<<a<<"(x+"<<abs(x)<<")(x+"<<abs(y)<<")"<<endl;
  61.     				}
  62.     			}
  63.     		}
  64.     	}
  65.     }
  66. };
  67. int main() {
  68. 	polynominal p(3,4,6),f(0,5,2),g(3,4,-6);
  69.     p.Write();
  70.     p.Solve();
  71.     p.form();
  72.     f.Write();
  73.     f.Solve();
  74.     f.form();
  75.     g.Write();
  76.     g.Solve();
  77.     g.form();
  78. 	return 0;
  79. }
Success #stdin #stdout 0s 5280KB
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stdin
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Standard input is empty
stdout
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3x²+4x+6
no real solution
cannot form because no real roots
0x²+5x+2
no real solution
cannot form because no real roots
3x²+4x-6
0.896805
-2.23014
3(x-0.896805)(x+2.23014)
https://ideone.com/ouW6PW
language:
C++14 (gcc 8.3)
created:
218 days ago
visibility:
public

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