Remove whitespace for the output in c++ - c++

Question

The following code is for printing the elements of a matrix in spiral order. The program works fine. The problem, however, is that the test compiler against which I'm checking the program, doesn't accept trailing white spaces at the end of the output. Could anyone give me some ideas as to how I can get around the last white space being added at the output?
#include <stdio.h>
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main()
{
string input;
int value;
int matrixA[10][10],matrixB[10][10],result[10][10];
int k=0,l=0,m=0,n=0;
int i=0,j=0;
cout<<"Enter first matrix:\n";
while(true)
{
//Read string from keyboard
getline(std::cin,input);
if(input.empty())
{
break;
}
//Parse string using sring stream
stringstream ss(input);
j=0;
while (ss >> value)
{
matrixA[i][j]=value;
j++;
if (ss.peek()==' ')
ss.ignore();
}
i++;
}
//Assign row and column length
k=i;
l=j;
cout<<"Enter second matrix:\n";
i=0;
while(true)
{
//Read string from keyboard
getline(std::cin,input);
if(input.empty())
{
break;
}
//Parse string using sring stream
stringstream ss(input);
j=0;
while (ss >> value)
{
matrixB[i][j]=value;
j++;
if (ss.peek()==' ')
ss.ignore();
}
i++;
}
//Assign row and column length
m=i;
n=j;
bool first=true;
if(l==m)
{
//Multiplication logic
for(i=0;i<k;i++)
{
for(j=0;j<n;j++)
{
result[i][j]=0;
for(int d=0;d<m;d++)
{
result[i][j]=result[i][j]+matrixA[i][d]*matrixB[d][j];
}
}
}
cout<<"The product is:\n";
//Display matrix result
for(i=0;i<k;i++)
{
for(j=0;j<n;j++)
{
cout<<result[i][0];
}
for(j=1;j<n;j++)
{
cout<<' '<<result[i][j];
}
cout << "\n";
}
}
else
{
cout<<"The two matrices have incompatible dimensions.\n";
}
return 0;
}
Sorry for the bad typing!