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  1. #include <iostream>
  2. #include <cstdlib>
  3. #include <ctime>
  4. using namespace std;
  5. void Set (double **a, int n, int m)
  6. {
  7.     for (int i = 0; i < n; i++)
  8.         for (int j=0; j < m; j++)
  9.         a[i][j]=rand()%9 + 1;
  10. }
  11.  
  12. void Top (double **a, int n, int m)
  13. {
  14. for (int i=0; i<n; i++)
  15.         for (int j=i+1; j<n; j++)
  16.             a[i][j] = 0;
  17. }
  18.  
  19. void Bottom (double **a, int n, int m, double &sum)
  20. {
  21.     sum=0.0;
  22.     for (int i=0; i<n; i++)
  23.         for(int j = 0; j <= i; j++)
  24.             sum+=a[i][j];
  25. }
  26.  
  27. void Print (double **a, int n, int m)
  28. {
  29.     for (int i = 0; i < n; i++)
  30.     {
  31.         for (int j=0; j < m; j++)
  32.             cout << a[i][j] << " ";
  33.         cout << "\n";
  34.     }
  35. }
  36.  
  37. int main()
  38. {
  39.     int n, m;
  40.     double sum;
  41.     cout << "n="; cin >> n;
  42.     cout << "m="; cin >> m;
  43.  
  44.       double **a = new double*[n];
  45.     for (int i = 0; i < n; i++)
  46.        a[i]=new double[m];
  47.  
  48.     Set(a,n,m);
  49.     cout << "Matrix:\n";
  50.     Print(a,n,m);
  51.     Top(a,n,m);
  52.     Bottom(a,n,m,sum);
  53.     cout << "Modified matrix:\n";
  54.     Print(a,n,m);
  55.     cout << "Summ\n"<<sum;
  56.     for (int i = 0; i < n; i++)
  57.     delete[]a[i];
  58.     delete[]a;
  59. system("pause");
  60. return 0;
  61. }
Success #stdin #stdout #stderr 0s 15240KB
comments (?)
stdin 
5 5
stdout 
n=m=Matrix:
2 8 1 8 6 
8 2 4 7 2 
6 5 6 8 6 
5 7 1 8 2 
9 9 7 7 9 
Modified matrix:
2 0 0 0 0 
8 2 0 0 0 
6 5 6 0 0 
5 7 1 8 0 
9 9 7 7 9 
Summ
91
stderr 
sh: 1: pause: not found
https://ideone.com/BTlgJZ
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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