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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. //write your code here
  5. class Matrix{
  6.   private:
  7.     int arr[3][3];
  8.   public:
  9.     friend istream& operator >> (istream& in,Matrix &matrix);
  10.     friend ostream& operator << (ostream& out,const Matrix& matrix);
  11.     friend Matrix operator + (Matrix &a,Matrix &b);
  12.     void setArr(int i,int j,int data){
  13.         arr[i][j] = data;
  14.     }
  15.     int getArr(int i,int j) const{
  16.     //                      ^^^^^ // Added const
  17.         return arr[i][j];
  18.     }
  19.     Matrix& operator = (const Matrix &b);
  20.     //                  ^^^^^ // Added const
  21. };
  22. istream& operator >> (istream& in,Matrix &matrix)
  23. {
  24.     for(int i=0;i<3;i++)
  25.         for(int j=0;j<3;j++)
  26.             in >> matrix.arr[i][j];
  27.     return in;
  28. }
  29. ostream& operator << (ostream& out,const Matrix &matrix){
  30.     for(int i=0;i<3;i++)
  31.     {
  32.         for(int j=0;j<3;j++)
  33.             out << matrix.arr[i][j] << " ";
  34.         out << endl;
  35.     }       
  36.     return out;
  37. }
  38. Matrix operator + (Matrix &a,Matrix &b){
  39.     Matrix temp;
  40.     for(int i=0;i<3;i++)
  41.         for(int j=0;j<3;j++)
  42.             temp.setArr(i,j,(a.getArr(i,j)+b.getArr(i,j)));
  43.     return temp;
  44.  
  45. }
  46. Matrix& Matrix::operator = (const Matrix &b){
  47. //                          ^^^^^ // Added const
  48.     for(int i=0;i<3;i++)
  49.         for(int j=0;j<3;j++)
  50.             arr[i][j] = b.getArr(i,j);
  51.     return *this;
  52. }
  53. int main()
  54. {
  55.     Matrix a1,a2,a3,a4;
  56.     cin >> a1;
  57.     cin >> a2;
  58.     a4 = a2;
  59.     a3 = (a1+a4); // No errors now
  60.     cout << a1 << endl;
  61.     cout << a2 << endl;
  62.     cout << a3 << endl;
  63.     return 0;
  64. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
Standard input is empty
stdout 
-1215588300 -1215598592 -1215414272 
-1215411920 1 -1079022288 
-1215488865 -1215411480 -1216923328 

1 1 0 
-1216237748 -1215593436 -1215594304 
-1079022316 -1218466669 134513424 

-1215588299 -1215598591 -1215414272 
1863317628 -1215593435 2000350704 
2000456115 1861089147 -1082409904
https://ideone.com/5qLBOR
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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