program name is ./cmdline
x=0 sin(x)=0
x=0.5 sin(x)=0.479426
x=1 sin(x)=0.841471
x=1.5 sin(x)=0.997495
x=2 sin(x)=0.909297
x=2.5 sin(x)=0.598472
x=3 sin(x)=0.14112
x=3.5 sin(x)=-0.350783
x=4 sin(x)=-0.756802
x=4.5 sin(x)=-0.97753
x=5 sin(x)=-0.958924