Write a C$++$ Code to solve the Runge Kutta Method of order $6$ below:

$($i$)y^{\text{'}}-\frac{1}{2}y+sin(t)=2,y(0)=1.$

Exact solution: $y(t)=\frac{4}{5}cos(t)+\frac{2}{5}sin(t)-4+\frac{21}{5}{e}^{\frac{1}{2}t}.$