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40.Matrices_diagonal.cpp
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40.Matrices_diagonal.cpp
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/**
* Diagonal matrix
* M[i,j] = 0 ;i!=j
* [1 0 0
* 0 1 0
* 0 0 1]
*/
// we only want to store nx elements.
#include<iostream>
using namespace std;
class matrix{
int n;
int *A;
public:
matrix(int n){
this->n = n;
A = new int[n];
}
matrix(){
cout<<"Enter dimension: ";
cin>>n;
A = new int[n];
}
void set_all();
void set(int i, int j, int x);
int get(int i, int j);
void display();
~matrix(){
delete []A;
}
};
void matrix::set_all(){
cout<<"Enter elements: ";
for(int i=0;i<n;i++)
cin>>A[i];
}
void matrix::set(int i, int j, int x){
//set element at given index
if(i==j)
A[i] = x;
}
int matrix::get(int i,int j){
//get element at given index
if(i==j)
return A[i];
else
return 0;
}
void matrix::display(){
//display matrix
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
cout<<get(i,j)<<" ";
}
cout<<"\n";
}
}
int main(){
matrix m;
m.set_all();
m.display();
cout<<"\nm[5,5]: "<<m.get(4,4);
}