Function SCIPgetNBilinTermsNonlinear 

pub unsafe extern "C" fn SCIPgetNBilinTermsNonlinear(
    conshdlr: *mut SCIP_CONSHDLR,
) -> c_int

returns the total number of bilinear terms that are contained in all nonlinear constraints

@note This method should only be used after auxiliary variables have been created, i.e., after CONSINITLP.