Created
November 6, 2020 05:59
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| #include <iostream> | |
| #include <ctime> | |
| using namespace std; | |
| int main() { | |
| srand(time(0)); | |
| int m = 5; | |
| double** a = new double*[m]; | |
| for (int i = 0; i < m; i++) { | |
| a[i] = new double[m + 1]; | |
| } | |
| for (int i = 0; i < m; i++) { | |
| for (int j = 0; j < m; j++) { | |
| a[i][j] = rand() % 21 - 10; | |
| } | |
| a[i][m] = rand() % 201 - 100; | |
| } | |
| for (int i = 0; i < m; i++) { | |
| for (int j = 0; j < m + 1; j++) { | |
| cout << a[i][j] << "\t"; | |
| } | |
| cout << endl; | |
| } | |
| cout << endl; | |
| for (int i = 0; i < m; i++) { | |
| int c = i; | |
| while (abs(a[c][i]) < 1e-15 && c < m) c++; | |
| swap(a[c], a[i]); | |
| for (int j = i + 1; j < m + 1; j++) | |
| a[i][j] /= a[i][i]; | |
| a[i][i] = 1; | |
| for (int k = i + 1; k < m; k++) { | |
| double y = a[k][i]; | |
| for (int j = 0; j < m + 1; j++) { | |
| a[k][j] -= a[i][j] * y; | |
| } | |
| } | |
| } | |
| for (int i = 0; i < m; i++) { | |
| for (int j = 0; j < m + 1; j++) { | |
| cout << a[i][j] << "\t"; | |
| } | |
| cout << endl; | |
| } | |
| double* x = new double[m]; | |
| for (int i = m - 1; i >= 0; i--) { | |
| x[i] = a[i][m]; | |
| for (int j = i + 1; j < m; j++) { | |
| x[i] -= x[j] * a[i][j]; | |
| } | |
| } | |
| cout << endl; | |
| for (int i = 0; i < m; i++) { | |
| cout << x[i] << "\t"; | |
| } | |
| cout << endl; | |
| } |
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