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  1. #include <cstdio>
  2.  
  3. int main()
  4. {
  5. 	size_t const max = 5;
  6. 	double matrix[5][5] = {
  7. 		4.6, 8.2, 8.4, 0.4, 8.0,
  8. 		3.8, 8.0, 9.6, 5.4, 8.8,
  9. 		1.4, 2.1, 2.1, 7.4, 9.6,
  10. 		2.6, 2.9, 0.1, 9.6, 7.7,
  11. 		1.6, 1.5, 1.1, 0.7, 5.0
  12. 	};
  13.  
  14. 	size_t count, row, column;
  15.  
  16. 	for(count = 0; count < max; count ++)
  17. 	{
  18. 		for (row=(count+1); row < max; row++)
  19. 		{
  20.         		for(column = 0; column < max; column ++)
  21.         		{
  22.             		double t = matrix[row][count]/matrix[count][count];
  23. 					printf("matrix[%d][%d] -= %f * %f\n", (int)row, (int)column, t, matrix[count][column]);
  24.             		matrix[row][column] = (matrix[row][column] - (t*matrix[count][column]));
  25.         		}
  26.   		}
  27. 	}
  28.  
  29. 	using std::printf;
  30. 	for (row = 0; row < max; ++row)
  31. 	{
  32. 		for (column = 0; column < max; ++column)
  33. 			printf("%f ", matrix[row][column]);
  34. 		printf("\n");
  35. 	}
  36. }
  37.  
Success #stdin #stdout 0s 3412KB
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stdout
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matrix[1][0] -= 0.826087 * 4.600000
matrix[1][1] -= 0.000000 * 8.200000
matrix[1][2] -= 0.000000 * 8.400000
matrix[1][3] -= 0.000000 * 0.400000
matrix[1][4] -= 0.000000 * 8.000000
matrix[2][0] -= 0.304348 * 4.600000
matrix[2][1] -= -0.000000 * 8.200000
matrix[2][2] -= -0.000000 * 8.400000
matrix[2][3] -= -0.000000 * 0.400000
matrix[2][4] -= -0.000000 * 8.000000
matrix[3][0] -= 0.565217 * 4.600000
matrix[3][1] -= -0.000000 * 8.200000
matrix[3][2] -= -0.000000 * 8.400000
matrix[3][3] -= -0.000000 * 0.400000
matrix[3][4] -= -0.000000 * 8.000000
matrix[4][0] -= 0.347826 * 4.600000
matrix[4][1] -= 0.000000 * 8.200000
matrix[4][2] -= 0.000000 * 8.400000
matrix[4][3] -= 0.000000 * 0.400000
matrix[4][4] -= 0.000000 * 8.000000
matrix[2][0] -= 0.262500 * 0.000000
matrix[2][1] -= 0.262500 * 8.000000
matrix[2][2] -= 0.000000 * 9.600000
matrix[2][3] -= 0.000000 * 5.400000
matrix[2][4] -= 0.000000 * 8.800000
matrix[3][0] -= 0.362500 * 0.000000
matrix[3][1] -= 0.362500 * 8.000000
matrix[3][2] -= 0.000000 * 9.600000
matrix[3][3] -= 0.000000 * 5.400000
matrix[3][4] -= 0.000000 * 8.800000
matrix[4][0] -= 0.187500 * 0.000000
matrix[4][1] -= 0.187500 * 8.000000
matrix[4][2] -= 0.000000 * 9.600000
matrix[4][3] -= 0.000000 * 5.400000
matrix[4][4] -= 0.000000 * 8.800000
matrix[3][0] -= 0.047619 * -0.000000
matrix[3][1] -= 0.047619 * 0.000000
matrix[3][2] -= 0.047619 * 2.100000
matrix[3][3] -= 0.000000 * 7.400000
matrix[3][4] -= 0.000000 * 9.600000
matrix[4][0] -= 0.523810 * -0.000000
matrix[4][1] -= 0.523810 * 0.000000
matrix[4][2] -= 0.523810 * 2.100000
matrix[4][3] -= -0.000000 * 7.400000
matrix[4][4] -= -0.000000 * 9.600000
matrix[4][0] -= 0.072917 * -0.000000
matrix[4][1] -= 0.072917 * 0.000000
matrix[4][2] -= 0.072917 * 0.000000
matrix[4][3] -= 0.072917 * 9.600000
matrix[4][4] -= -0.000000 * 7.700000
4.600000 8.200000 8.400000 0.400000 8.000000 
0.000000 8.000000 9.600000 5.400000 8.800000 
-0.000000 0.000000 2.100000 7.400000 9.600000 
-0.000000 0.000000 0.000000 9.600000 7.700000 
0.000000 0.000000 -0.000000 -0.000000 5.000000
https://ideone.com/i5juvn
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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