Declare variables, int choice; float Num$1,$ Num$2,$ Add, Sub, Mul, Div.$$

$2.$ Ask the user to key in Num$1$ and Num$2.$ Read Num$1$ and Num$2.$

$3.$ Ask the user to key in the choice $(1$: Add, $2$: Sub, $3$: Mul, $4$: Div$).$ Read choice.$$

$4.$ if $($choice$==1)$

$4\mathrm{.}1$ Calculate Add $=$ Num$1+$ Num$2.$

$4\mathrm{.}2$ Display Add.$$

$$ else if $($choice$==2)$

Calculate Sub $=$ Num$1-$ Num$2.$

Display Sub.$$

$$ else if $($choice$==3)$

Calculate Mul $=$ Num$1$ x Num$2.$

Display Mul.$$

$$ else if $($choice$==4)$

Calculate Div $=$ Num$1/$ Num$2.$

Display Div.$$

End main$$