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#include <iostream>
#include<iomanip>
using namespace std;
 
int main()
{int n,i,j,k,a,X;
 cout.precision(4);
 cout.set(ios::fixed);
 cout<<"\n enter the elements of augmented matrixs row wise \n";
 for (i=0;i<n;i++)
 for (j=o;j<=n;j++)
 cin>>a[i][j];
  for (i=0;i<n;i++)
  for(k=i+1;k<n;k++)
  if(abs(a[i][i])<abs(a[k][i]))
  for(j=0;j<=n;j++)
  {double temp=a[i][j];
   a[i][j]=a[k][j];
   a[k][j]=temp;
  }
  cout<<"\n the matrix after pivotisation is: \n";
  for (i=0;i<n;i++)
  {
  	  for (j=o;j<=n;j++)
  	  cout<<a[i][j]<<setw(16);
  	  cout<<"\n";
  }
	for (i=0;i<n-1;i++)
    for(k=i+1;k<n;k++)
    {
    	double t=a[k][i]/a[i][i];
    	for (j=0;j<=n;j++)
    	a[k][j]=a[k][j]-t*a[i][j];
    }
    cout<<"\n matrix after gauss elimination is as follows:\n";
     for (i=0;i<n;i++)
      {
  	     for (j=o;j<=n;j++) 
  	     cout<<a[i][j]<<setw(16);
  	     cout<<"\n";
      }
      for(i=n-1;i>=0;i--)
      {X[i]=a[i][n];
         for (j=i+1;j<n;j++)
         if(j!=i)
           X[i]=X[i]-a[i][j]*X[j];
           X[i]=X[i]/a[i][j];
      }
      cout<<"\n the values of variables are as follows :\n";
      for (i=0;i<n;i++)
      cout<<X[i]<<end l;
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:8:7: error: ‘std::ostream {aka class std::basic_ostream<char>}’ has no member named ‘set’; did you mean ‘setf’?
  cout.set(ios::fixed);
       ^~~
prog.cpp:11:9: error: ‘o’ was not declared in this scope
  for (j=o;j<=n;j++)
         ^
prog.cpp:12:10: error: invalid types ‘int[int]’ for array subscript
  cin>>a[i][j];
          ^
prog.cpp:15:13: error: invalid types ‘int[int]’ for array subscript
   if(abs(a[i][i])<abs(a[k][i]))
             ^
prog.cpp:15:26: error: invalid types ‘int[int]’ for array subscript
   if(abs(a[i][i])<abs(a[k][i]))
                          ^
prog.cpp:17:19: error: invalid types ‘int[int]’ for array subscript
   {double temp=a[i][j];
                   ^
prog.cpp:18:7: error: invalid types ‘int[int]’ for array subscript
    a[i][j]=a[k][j];
       ^
prog.cpp:18:15: error: invalid types ‘int[int]’ for array subscript
    a[i][j]=a[k][j];
               ^
prog.cpp:19:7: error: invalid types ‘int[int]’ for array subscript
    a[k][j]=temp;
       ^
prog.cpp:24:13: error: ‘o’ was not declared in this scope
      for (j=o;j<=n;j++)
             ^
prog.cpp:25:15: error: invalid types ‘int[int]’ for array subscript
      cout<<a[i][j]<<setw(16);
               ^
prog.cpp:31:18: error: invalid types ‘int[int]’ for array subscript
      double t=a[k][i]/a[i][i];
                  ^
prog.cpp:31:26: error: invalid types ‘int[int]’ for array subscript
      double t=a[k][i]/a[i][i];
                          ^
prog.cpp:33:9: error: invalid types ‘int[int]’ for array subscript
      a[k][j]=a[k][j]-t*a[i][j];
         ^
prog.cpp:33:17: error: invalid types ‘int[int]’ for array subscript
      a[k][j]=a[k][j]-t*a[i][j];
                 ^
prog.cpp:33:27: error: invalid types ‘int[int]’ for array subscript
      a[k][j]=a[k][j]-t*a[i][j];
                           ^
prog.cpp:38:16: error: ‘o’ was not declared in this scope
         for (j=o;j<=n;j++)
                ^
prog.cpp:39:18: error: invalid types ‘int[int]’ for array subscript
         cout<<a[i][j]<<setw(16);
                  ^
prog.cpp:43:11: error: invalid types ‘int[int]’ for array subscript
       {X[i]=a[i][n];
           ^
prog.cpp:43:16: error: invalid types ‘int[int]’ for array subscript
       {X[i]=a[i][n];
                ^
prog.cpp:46:15: error: invalid types ‘int[int]’ for array subscript
            X[i]=X[i]-a[i][j]*X[j];
               ^
prog.cpp:46:20: error: invalid types ‘int[int]’ for array subscript
            X[i]=X[i]-a[i][j]*X[j];
                    ^
prog.cpp:46:25: error: invalid types ‘int[int]’ for array subscript
            X[i]=X[i]-a[i][j]*X[j];
                         ^
prog.cpp:46:33: error: invalid types ‘int[int]’ for array subscript
            X[i]=X[i]-a[i][j]*X[j];
                                 ^
prog.cpp:47:15: error: invalid types ‘int[int]’ for array subscript
            X[i]=X[i]/a[i][j];
               ^
prog.cpp:47:20: error: invalid types ‘int[int]’ for array subscript
            X[i]=X[i]/a[i][j];
                    ^
prog.cpp:47:25: error: invalid types ‘int[int]’ for array subscript
            X[i]=X[i]/a[i][j];
                         ^
prog.cpp:51:16: error: invalid types ‘int[int]’ for array subscript
       cout<<X[i]<<end l;
                ^

Standard output is empty