#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int i,j,k,n,i0;
cout<<"please enter the order number of the equation."<<endl;
double a[10][10],b[10],l[10][10],x[10],sum,maxone;
bool flag=true;
cin>>n;
cin.clear();
cout<<"please enter the number of the equation."<<endl;
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
cin>>a[i][j];
cin.clear();
cin>>b[i];
cin.clear();
cout<<endl;
}
for (k=1;k<n;k++)
{
maxone=0;
for(i=k;i<=n;i++)
{
if(fabs(a[i][k])>maxone)
{
maxone=fabs(a[i][k]);
i0=i;
}
}
if (maxone==0)
{
cout<<"the result of this equation is not only one.so stop calculate."<<endl;
flag=false;
break;
}
else
{
if(i0!=k)
{
double temp[10];
for (j=1;j<=n;j++)
{
temp[j]=a[i0][j];
a[i0][j]=a[k][j];
a[k][j]=temp[j];
}
}
//if (a[k][k]!=0)
//{
for(i=k+1;i<=n;i++)
{
l[i][k]=a[i][k]/a[k][k];
b[i]=b[i]-l[i][k]*b[k];
for(j=k+1;j<=n;j++)
a[i][j]=a[i][j]-l[i][k]*a[k][j];
}
//}
}
}
if(flag==true)
{
if (a[n][n]!=0)
{
x[n]=b[n]/a[n][n];
for (i=n-1;i>0;i--)
{
sum=0;
for (j=i+1;j<=n;j++)
{
sum+=a[i][j]*x[j];
}
x[i]=(b[i]-sum)/a[i][i];
}
}
cout<<"the result of the equation is:"<<endl;
for(i=1;i<=n;i++)
cout<<x[i]<<" ";
cout<<endl;
}
system("pause");
return 0;
}
pingfanggen.zip （38个子文件） 
平方根法 
code3_3.sdf 5.39MB code3_3.sln 888B code3_3.suo 15KB code3_3 code3_3.cpp 1KB code3_3.vcxproj.filters 956B code3_3.vcxproj 4KB code3_3.vcxproj.user 143B Debug vc100.idb 339KB CL.write.1.tlog 838B CL.read.1.tlog 17KB mt.read.1.tlog 798B rc.write.1.tlog 690B link.4812.read.1.tlog 2B rc.read.1.tlog 674B code3_3.exe.intermediate.manifest 381B link.4812.write.1.tlog 2B code3_3_manifest.rc 204B mt.command.1.tlog 814B cl.command.1.tlog 1KB link-cvtres.read.1.tlog 2B code3_3.obj 48KB code3_3.log 771B code3_3.exe.embed.manifest.res 472B link.write.1.tlog 2KB link.4812-cvtres.write.1.tlog 2B code3_3.exe.embed.manifest 406B code3_3.lastbuildstate 48B link-cvtres.write.1.tlog 2B link.command.1.tlog 3KB rc.command.1.tlog 1KB link.read.1.tlog 6KB mt.write.1.tlog 462B link.4812-cvtres.read.1.tlog 2B vc100.pdb 236KB ipch code3_3-81c50691 code3_3-8ba74fec.ipch 14.56MB Debug code3_3.ilk 418KB
code3_3.exe 39KB code3_3.pdb 619KB资源评论
