Function SCIPexprGetQuadraticBilinTerm 

pub unsafe extern "C" fn SCIPexprGetQuadraticBilinTerm(
    expr: *mut SCIP_EXPR,
    termidx: c_int,
    expr1: *mut *mut SCIP_EXPR,
    expr2: *mut *mut SCIP_EXPR,
    coef: *mut f64,
    pos2: *mut c_int,
    prodexpr: *mut *mut SCIP_EXPR,
)

gives the data of a bilinear expression term

For a term aexpr1expr2, returns expr1, expr2, a, and the position of the quadratic expression term that uses expr2 in the quadratic expressions quadexprterms.