Inverse of Matrix

// inverse of a 2 by 2 matrix

#include<iostream.h>
void main()
{
float a[2][2], inv[2][2], d, temp;
int i, j;

// initializing 2 D array a with user defined values

cout<<"Enter values for array A"<<endl<<endl;

for(i=0;i<2;i++)
{
  for(j=0;j<2;j++)
  {
    cout<<"enter value for a["<<i<<"]["<<j<<"]:";
    cin>>a[i][j];
  }
}

// origional array A

cout<<"displaying origional array A:"<<endl<<endl;

for(i=0;i<2;i++)
{
  for(j=0;j<2;j++)
  {
cout<<a[i][j]<<" ";
  }
  cout<<endl;
}

cout<<endl<<endl;

// determinant of A

d = a[0][0]*a[1][1] - a[0][1]*a[1][0];
cout<<"determinant of A is "<<d<<endl<<endl;

// adjoint of A

temp = a[0][0];
a[0][0] = a[1][1];
a[1][1] = temp;
a[1][0] = -1*a[1][0];
a[0][1] = -1*a[0][1];

// origional array A

cout<<"displaying origional array A:"<<endl<<endl;

for(i=0;i<2;i++)
{
  for(j=0;j<2;j++)
  {
cout<<a[i][j]<<" ";
  }
  cout<<endl;
}

cout<<endl<<endl;

// inverse of A

cout<<"displaying inverse of array A:"<<endl<<endl;

for(i=0;i<2;i++)
{
  for(j=0;j<2;j++)
  {
    inv[i][j] = a[i][j]/d;
cout<<inv[i][j]<<" ";
  }
  cout<<endl;
}

}