#include <iostream>
#include <cmath>
using namespace std;
void print44(double A[4][4])
{
for (int i=0;i<4;i++)
{
for (int j=0;j<4;j++)
{
cout<<A[i][j]<<" ";
}
cout<<endl;
}
}
double sumau (int i, int j, double A[4][4])
{
double suma=0;
for (int k=0;k<(i-1);k++)
{
suma=suma+A[i][k]+A[k][j];
}
return suma;
}
double sumal (int i, int j, double A[4][4])
{
double suma=0;
for (int k=0;k<(i-1);k++)
{
suma=suma+A[j][k]+A[k][i];
}
return suma;
}
int main ()
{
double A[4][4]={{3,-4,4,-4},
{1.5,-1,2,-2},
{1.5,-0.5,0,-3},
{4.5,-5.5,4,-9}};
print44(A);
double u[4][4];
double l[4][4];
for (int i=0; i<4;i++)
{
for (int j=0;j<4;j++)
{
if (i<=j) A[i][j]=A[i][j]-sumau(i,j,A);
if (i<j) A[j][i]=(A[j][i]-sumal(i,j,A))/A[i][i];
}
}
cout<<endl;
print44(A);
system("Pause");
return 0;
}
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