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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. class tamgiac{
  4. 	float a,b,c;
  5. 	public:
  6. 		tamgiac(){
  7. 			a=b=c=0;
  8. 		}
  9. 		tamgiac(float x,float y,float z){
  10. 			a=x;
  11. 			b=y;
  12. 			c=z;
  13. 		}
  14. 		friend istream&operator>>(istream&x,tamgiac & y);
  15. 		friend ostream&operator<<(ostream&x,tamgiac y);
  16. 		bool operator*();
  17. 		bool operator==(tamgiac y);
  18. };
  19. istream&operator>>(istream&x,tamgiac & y){
  20. 	cout<<"canh a="; x>>y.a;
  21. 	cout<<"canh b="; x>>y.b;
  22. 	cout<<"canh c="; x>>y.c;
  23. 	return x;
  24. }
  25. ostream&operator<<(ostream&x,tamgiac y){
  26. 	cout<<"canh a="<<y.a<<endl;
  27. 	cout<<"canh b="<<y.b<<endl;
  28. 	cout<<"canh c="<<y.c<<endl;
  29. 	return x;
  30. }
  31. bool tamgiac::operator*(){
  32. 	return(a==b&&a==c&&b==c);
  33. }
  34. bool tamgiac::operator==(tamgiac y){
  35. 	float p1=(a+b+c)/2;
  36. 	float p2=(y.a+y.b+y.c)/2;
  37. 	float S1=sqrt(p1*(p1-a)*(p1-b)*(p1-c));
  38. 	float S2=sqrt(p2*(p2-y.a)*(p2-y.b)*(p2-y.c));
  39. 	return (S1==S2);
  40. }
  41. int main(){
  42. 	tamgiac A,B;
  43. 	cout<<"nhap thong tin tam giac A: "<<endl;
  44. 	cin>>A;
  45. 	cout<<"nhap thong tin tam giac B: "<<endl;
  46. 	cin>>B;
  47. 	cout<<"thong tin tam giac A: "<<endl;
  48. 	cout<<A;
  49. 	cout<<"thong tin tam giac B: "<<endl;
  50. 	cout<<B;
  51. 	ofstream f("tamgiacdeu.txt");
  52. 	if(*A){
  53. 		cout<<"tam giac A la tam giac deu"<<endl;
  54. 		f<<"tam giac A la tam giac deu"<<endl;
  55. 	}
  56. 	else{
  57. 		cout<<"tam giac A la tam giac thuong"<<endl;
  58. 		f<<"tam giac A la tam giac thuong"<<endl;
  59. 	}
  60. 	if(*B){
  61. 		cout<<"tam giac B la tam giac deu"<<endl;
  62. 		f<<"tam giac B la tam giac deu"<<endl;
  63. 	}
  64. 	else{
  65. 		cout<<"tam giac B la tam giac thuong"<<endl;
  66. 		f<<"tam giac B la tam giac thuong"<<endl;
  67. 	}
  68. 	if(A==B){
  69. 		cout<<"2 tam giac co dien tich bang nhau!"<<endl;
  70. 		f<<"2 tam giac co dien tich bang nhau!"<<endl;
  71. 	}
  72. 	else{
  73. 	    cout<<"2 tam giac ko co dien tich bang nhau!"<<endl;
  74. 		f<<"2 tam giac ko co dien tich bang nhau!"<<endl;
  75. 	}
  76. 	f.close();
  77. 	return 0;
  78. }
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
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Standard input is empty
stdout
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nhap thong tin tam giac A: 
canh a=canh b=canh c=nhap thong tin tam giac B: 
canh a=canh b=canh c=thong tin tam giac A: 
canh a=0
canh b=0
canh c=0
thong tin tam giac B: 
canh a=0
canh b=0
canh c=0
tam giac A la tam giac deu
tam giac B la tam giac deu
2 tam giac co dien tich bang nhau!
https://ideone.com/u5NMSg
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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