problem with coding for linear interpolation

Hello all,

I am new to matlab and I am running this code but it is not running at all and the loop won't end. Can you please help me why this happens?

blow = -2;
bhigh = 4;
bnum = 10;
lb = log(blow-blow+1.0)/log(10);
ub = log(bhigh-blow+1.0)/log(10);
bgrid = logspace(lb,ub,bnum);
bgrid = bgrid+ones(size(bgrid))*(blow-1.0);
for i=1:1:bnum
    bfval = bgrid(i);
    ilow = 1; ihigh = 10;
    distance=2;
    value = bfval;
    
    while (distance>1)
        if (value>-0.6254)
            ilow=5;
        else 
            ihigh = 5;
            
        end
        distance = ihigh- ilow;
        
        
    end
    iloc = ilow;
    if (value > bgrid(iloc))&&(value<bgrid(iloc+1))
        weight = (bgrid(iloc+1)-value)/(bgrid(iloc+1)-bgrid(iloc));
    elseif (value<=grid(1))
        weight = 1; iloc = 1;
    else
        weight = 0; iloc = 9;
    end
end

Thank you so much for your help.

[KSSV]

The condition

distance>1

is always met as the value of distance = 4 is fixed always and not changing.