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  1. #include <iostream>
  2. #include <vector>
  3. #include <stdlib.h>
  4.  
  5. using namespace std;
  6.  
  7. void initialize_matrix(vector< vector<int> > &a, int m, int n)
  8. {
  9.   int i, j;
  10.  
  11.   // make sure the matrix has the given number of rows,
  12.   // and that each row has the right number of elements
  13.   // one for each column; number of rows is m, number of
  14.   // columns is n
  15.  
  16.   a.resize(m);
  17.  
  18.   for (i=0; i<m; i++)
  19.     a[i].resize(n);
  20.  
  21.   // generate the matrix
  22.  
  23.   for (i=0; i<m; i++)
  24.     for (j=0; j<n; j++)
  25.       a[i][j] = drand48()*101; // random integer from 0 to 100
  26. }
  27.  
  28.  
  29. void add_matrices(vector< vector<int> > &result, 
  30. 		  vector< vector<int> > &a,
  31. 		  vector< vector<int> > &b)
  32. {
  33.   int i, j;
  34.   int m = a.size();
  35.   int n = a[0].size();
  36.  
  37.   result.resize(m);
  38.   for (i=0; i<m; i++)
  39.     result[i].resize(n);
  40.  
  41.   // execute the addition
  42.  
  43.   for (i=0; i<m; i++)
  44.     for (j=0; j<n; j++)
  45.       result[i][j] = a[i][j] + b[i][j];
  46. }
  47.  
  48. void print_matrix(vector< vector<int> > &a)
  49. {
  50.   int i, j;
  51.   int m = a.size();
  52.   int n = a[0].size();
  53.  
  54.   for (i=0; i<m; i++)
  55.     {
  56.       for (j=0; j<n; j++)
  57. 	cout << a[i][j] << " ";
  58.       cout << endl;
  59.     }
  60. }
  61.  
  62. int main()
  63. {
  64.   int m, n;
  65.   vector< vector<int> > a;
  66.   vector< vector<int> > b;
  67.   vector< vector<int> > c;
  68.  
  69.   // read matrix size from input
  70.  
  71.   cin >> m;
  72.   cin >> n;
  73.  
  74.   // set random seed
  75.  
  76.   srand48(123);
  77.  
  78.   // initialize the matrices a and b
  79.  
  80.   initialize_matrix(a, m, n);
  81.   initialize_matrix(b, m, n);
  82.  
  83.   // add a and b into c
  84.  
  85.   add_matrices(c, a, b);
  86.  
  87.   // print the matrices
  88.  
  89.   cout << endl << "Matrix A:" << endl;
  90.   print_matrix(a);
  91.  
  92.   cout << endl << "Matrix B:" << endl;
  93.   print_matrix(b);
  94.  
  95.   cout << endl << "Matrix C = A + B:" << endl;
  96.   print_matrix(c);
  97.  
  98.   return 0;
  99. }
  100.  
Success #stdin #stdout 0.02s 2824KB
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stdin
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5 5
stdout
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Matrix A:
28 41 93 13 12 
35 63 84 70 15 
78 37 94 14 85 
12 82 39 91 15 
91 53 29 86 35 

Matrix B:
86 74 13 72 86 
75 94 6 92 62 
99 24 55 90 67 
89 64 15 53 93 
46 20 97 30 15 

Matrix C = A + B:
114 115 106 85 98 
110 157 90 162 77 
177 61 149 104 152 
101 146 54 144 108 
137 73 126 116 50
https://ideone.com/IvA2h
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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