Switch to the Java Snippet node. The syntax is somewhat comparable and, if I understood your question correctly, is capable of doing this.
Example input:
You can calculate total_value and unit_value in one go and also output them simultaneously.
double total_value = c_para1 * c_para2;
out_unit_value = total_value / c_qty;
out_total_value = total_value;
Output:
