Getting different output from seemingly identical calculations

Question

Can anyone tell me why the calculations on lines 9 and 11, which seem to be identical, produce two different outputs. I know the difference isn\'t that great, but I am using the

Answer 1

This is outputting a floating point number

 std::cout <<  400+(sin((90*3.14159)/180)*10) << std::endl;

But this is outputting an integer, so will have been truncated

std::cout << ypos << std::endl;