fprintf,input和disp函数

r = 5;
S = pi * r * r;
fprintf(' Area = %f\n', S);

运行结果

 >> ex4_2
 Area = 78.539816

x = input('enter ''x'' :');
if( x > 0 )
    y = 1;
elseif(x == 0)
    y = 0;
else
    y = -1;
end
disp(y)

运行结果

>> ex4_4
enter 'x' :10
     1