Error:Missing variable or function.matlabradius=2.5;area=pi*2.5^2;string=['the area of the circle is ',num2str(area)];disp(string);

Error:Missing variable or function.matlabradius=2.5;area=pi*2.5^2;string=['the area of the circle is ',num2str(area)];disp(string);
Error:Missing variable or function.matlab
radius=2.5;
area=pi*2.5^2;
string=['the area of the circle is ',num2str(area)];
disp(string);

Error:Missing variable or function.matlabradius=2.5;area=pi*2.5^2;string=['the area of the circle is ',num2str(area)];disp(string);

这句话没有问题啊 

有图