Summation of Matrices

public class arraydemomatrixsum {

static void matrixsum(int x[][])
{
int i,j,c,b=0,a=0;

for(i=0;i<3;i++)
{ c=0;
System.out.print(" ");
for(j=0;j<3;j++)
{
System.out.print(x[i][j]+" ");
c=c+x[i][j];
if(i==j)
{
b=b+x[i][j];
}
if(i+j==2)
{
a=a+x[i][j];
}
}
System.out.print(c);
System.out.println("");
}
System.out.print(a);
for(j=0;j<3;j++)
{ c=0;
for(i=0;i<3;i++)
{
c=c+x[i][j];
}
System.out.print(c+" ");

}
System.out.print(b);
}
public static void main(String[] args)
{
matrixsum(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}