x=input('enter x:');
h=input('enter h:');
l_x=length(x);
l_h=length(h);
X=[x,zeros(1,l_x)];
H=[h,zeros(1,l_h)];
for k=1:l_x+l_h-1
y(k)=0;
for n=1:a
if (k-n+1)>0
y(k)=y(k)+x(n)*h(k-n+1);
end
