f[0](1) = 0.841471 f[1](1) = 0.540302 f[2](1) = 1.55741 
F.a(1)=0.841471 F.b(1)=0.540302
f_of_1 = 0.841471
f_of_1 = 0.540302
f_of_1 = 1.55741
f_of_1 = 0.842701
command line argument = 6.78
hello
x = 1.23
x = 2.34
x = 3.45