if condition_exp1 then
    statement_1;
else if condition_exp2 then
    statement_2;
else if condition_expN then
    statement_N;
else
    statement_E;

if condition_exp1 then do;
    list_of_statements;
end;
else if condition_exp2 then do;
    list_of_statements;
end;
else if condition_expN then do;
    list_of_statements;
end;
else do;
    list_of_statements;
end;