//this program has been tested
cls
u first=First name:
u last=Last name:
u age=Age:
u gender=Female or Male?

if $age$<18
    echo Hello, $first$.
    echo You are under 18.
endif

if $age$>17
    if $gender$=male
        echo Hello, Mr. $last$.
    endif
    if $gender$=female
        echo Hello, Ms. $last$.
    endif
endif