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4.8.2 While 循环
While 语句用于满足一定条件的循环，语法结构如下：
while
while expression
command group A
end
sum = 0;
k = 1;
while x(k) >= 0 & k <= length(k)
sum = sum + x(k);
k = k+1;
end
此外可以利用break命令跳出for,while循环,如下例，计算MATLAB可以计算的最小正值：
>> num=0; EPS=1;
>> for num=1:1000
EPS=EPS/2;
if (1+EPS) <= 1
break
end
end
>> EPS, num
>> EPS =
1.1102e-016
>> num =
53
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