C++. Крамер, Гаусс, БД, текст. лабораторная за 1 семестр / Гаусс

#include<iostream.h>
#include<conio.h>
void main(void)
{
int rows, lines = 0;
int i,j,d=0;
float sum=0;
	start:
//Vvod parametrov massiva: stolbcy i stroky
	cout<<"Input lines of matrix\n";
	cin>>lines;
	cout<<"Input rows of matrix\n";
	cin>>rows;
	if(rows<lines)
		{
		cout<<"\nRows was input non correct\n";
		goto start;
		}

//Sozdanie dinamicheskogo massiva v kotoriy budut zapisivatsy elementy matrix
	float **matrix = new float*[lines];
	for(i=0; i<rows; i++)
   		*(matrix+i)=new float[rows];
	float *roots = new float [rows-1];
	cout<<"Input element of matrix\n";
	for(i=0; i<lines; i++)
   		for(j=0; j<rows; j++)
      		cin>>matrix[i][j];

//	cout<<"\nPress any key...\n";
//	getch();

//Poisk elementov = 0 na glavnoy diagonaly
	for(i=0; i<lines; i++)
   		if(!matrix[i][i])
			{
	        for(j=i+1; j<lines; j++)
		    if(matrix[j][i])
				{
				float *f=matrix[i];
				matrix[i]=matrix[j];
				matrix[j]=f;
				}
    		}
	
//	cout<<"\nPress any key...\n";
//	getch();
	
//Vivod resultatov posle udaleniy nuley is glavnoy diagonaly
	for(i=0; i<lines; i++)
   		{
		cout<<endl;
   		for(j=0; j<rows; j++)
			cout<<matrix[i][j]<<ends;
		}

//	cout<<"\nPress any key...\n"<<endl;
//	getch();

//Privedenie k stupenchatomu vidu
	for (j=0; j<rows-1; j++)
    {
		for (i=0; i<lines; i++)
		{
			if ( (i>j) && (matrix[i] [j] !=0) )
				for (d=rows-1; d>=0; d--)
					matrix[i][d]-=matrix[j][d]*matrix[i][j];
		    if (i==j) for (d=rows-1; d>=0; d--)
				matrix[i][d]/=matrix[i][j];
		}
	}

//	cout<<"\nPress any key...\n";
//	getch();
	cout<<endl<<endl<<endl;


//Vivod resultatov posle privedeniy
		for(i=0; i<lines; i++)
		{
			cout<<endl;
   			for(j=0; j<rows; j++)
      			cout<<matrix[i][j]<<ends;
		}
//	cout<<"\nPress any key...\n";
//	getch();


// Poisk korney
	cout  << endl << endl << "Roots:";
	for (i=rows-2; i>=0; i--) {
        for (j=rows-2; j>i; j--)
                sum+=roots[j]*matrix[i][j];
        roots[i]=matrix[i][rows-1]-sum;
        sum=0;
   }
// Vivod korney
	for(i=0; i<rows-1; i++)
		cout << endl << "X" << i + 1 << " = " << roots [i];
	cout<<"\n\n\ndelete matrix"<<endl;

//Deleting matrix
	for(i=0; i<rows; i++)
		delete matrix[i];
	cout<<"\n\nPress any key..."<<endl;
	getch();
	
}