function y=fitness(s,x)

% y=s(ceil(rand*4));
% y=strcat('x',y);
y=x;
ss='';
a1=find(s=='+');
ss(a1)='+';
a1=find(s=='-');
ss(a1)='-';
a1=find(s=='*');
ss(a1)='*';
a1=find(s=='/');
ss(a1)='/';
for i=1:1:length(ss)
        if ss(i)=='*'
        y=y*x;
        elseif ss(i)=='/'
            y=y/x;
        elseif ss(i)=='+'
            y=y+x;
        else
            y=y-x;
        end
    
end