判断从6到上限x的大偶数是否成立：
clear;clc;
x=input('x=')
n=0;
t=x./2-2;
if mod(x,2)>0|x<6
disp('data error!')
return
end
for m=2*(3:x./2)
for i=2:m./2
k=zhs(i);
k1=k;
k=zhs(m-i);
k2=k;
if k1>=1&k2>=1;
n=n+1;
fprintf('%.0f %.0f=%.0f+%.0f\n',n,m,i,m-i)
break
end
end
end
if n>=t&n<=t;
disp('the numbers which have been examed are all correct!')
elseif n>t|n<t;
disp('it is wrong!')
end
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