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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cout << " Enter the number of variables :  ";
  7. 	cin >>n;
  8. 	double v[10][10];
  9. 	double id[10][10];
  10. 	for(int i=0;i<10;i++)
  11. 	{
  12. 		for(int j=0;j<10;j++)
  13. 			{
  14. 				if(i==j)
  15. 					id[i][j]=1;
  16. 				else
  17. 					id[i][j]=0;
  18. 			}
  19. 	}
  20. 	cout <<"Enter matrix a\n";
  21. 	for(int i=0;i<n;i++)
  22. 	{
  23. 		for(int j=0;j<n;j++)
  24. 			cin >> v[i][j];
  25. 	}
  26. 	cout <<"Enter matrix b\n";
  27. 	for(int i=0;i<n;i++)
  28. 	{
  29. 		cin >> v[i][n];
  30. 	}
  31. 	double c;
  32.  
  33.  
  34.  
  35. 	int k=0;
  36. 	while(k<n)
  37. 	{
  38.  
  39. 	if(v[k][k]!=1)    
  40. 	{    
  41.  
  42. 		c=v[k][k];
  43. 		if(c==0)    c=1;
  44. 		for(int j=0;j<=n;j++)
  45. 		{
  46. 			    v[k][j]/=c;
  47. 		}
  48. 	}
  49.  
  50.  
  51. 	cout << "Matrix a is :\n";
  52. 	for(int i=0;i<n;i++)
  53. 	{
  54. 	    for(int j=0;j<=n;j++)
  55. 	        cout << v[i][j]<< " ";
  56. 	   cout <<"\n";
  57. 	}
  58.  
  59. 	for(int i=0;i<n;i++)
  60. 	{   
  61.  
  62. 	    c=v[i][k]/v[k][k];
  63. 	    if(i!=k)
  64. 	    {
  65. 	    for(int j=0;j<=n;j++)
  66. 	    {
  67. 	        v[i][j]-=c*v[k][j];
  68. 	    }
  69. 	    } 
  70.  
  71.  
  72. 	}
  73. 	k++;
  74.  
  75.  
  76.  
  77. 	cout << "Matrix a is :\n";
  78. 	for(int i=0;i<n;i++)
  79. 	{
  80. 	    for(int j=0;j<=n;j++)
  81. 	        cout << v[i][j]<< " ";
  82. 	   cout <<"\n";
  83. 	}
  84. 	}
  85.  
  86. 	return 0;
  87. }
Success #stdin #stdout 0.01s 5548KB
comments (?)
stdin
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3
1 1 1 
2 -3 4
3 4 5
9 13 40
stdout
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 Enter the number of variables :  Enter matrix a
Enter matrix b
Matrix a is :
1 1 1 9 
2 -3 4 13 
3 4 5 40 
Matrix a is :
1 1 1 9 
0 -5 2 -5 
0 1 2 13 
Matrix a is :
1 1 1 9 
-0 1 -0.4 1 
0 1 2 13 
Matrix a is :
1 0 1.4 8 
-0 1 -0.4 1 
0 0 2.4 12 
Matrix a is :
1 0 1.4 8 
-0 1 -0.4 1 
0 0 1 5 
Matrix a is :
1 0 0 1 
0 1 0 3 
0 0 1 5
https://ideone.com/Cvzl3c
language:
C++14 (clang 8.0)
created:
1 year ago
visibility:
public

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