Function SCIPcreateVar 

pub unsafe extern "C" fn SCIPcreateVar(
    scip: *mut SCIP,
    var: *mut *mut SCIP_VAR,
    name: *const c_char,
    lb: f64,
    ub: f64,
    obj: f64,
    vartype: SCIP_VARTYPE,
    initial: c_uint,
    removable: c_uint,
    vardelorig: Option<unsafe extern "C" fn(scip: *mut SCIP, var: *mut SCIP_VAR, vardata: *mut *mut SCIP_VARDATA) -> SCIP_RETCODE>,
    vartrans: Option<unsafe extern "C" fn(scip: *mut SCIP, sourcevar: *mut SCIP_VAR, sourcedata: *mut SCIP_VARDATA, targetvar: *mut SCIP_VAR, targetdata: *mut *mut SCIP_VARDATA) -> SCIP_RETCODE>,
    vardeltrans: Option<unsafe extern "C" fn(scip: *mut SCIP, var: *mut SCIP_VAR, vardata: *mut *mut SCIP_VARDATA) -> SCIP_RETCODE>,
    varcopy: Option<unsafe extern "C" fn(scip: *mut SCIP, sourcescip: *mut SCIP, sourcevar: *mut SCIP_VAR, sourcedata: *mut SCIP_VARDATA, varmap: *mut SCIP_HASHMAP, consmap: *mut SCIP_HASHMAP, targetvar: *mut SCIP_VAR, targetdata: *mut *mut SCIP_VARDATA, result: *mut SCIP_RESULT) -> SCIP_RETCODE>,
    vardata: *mut SCIP_VARDATA,
) -> SCIP_RETCODE

creates and captures problem variable

If variable is of integral type, fractional bounds are automatically rounded. An integer variable with bounds zero and one is automatically converted into a binary variable.

@warning When doing column generation and the original problem is a maximization problem, notice that SCIP will transform the problem into a minimization problem by multiplying the objective function by -1. Thus, the original objective function value of variables created during the solving process has to be multiplied by -1, too.

@return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref SCIP_Retcode “SCIP_RETCODE” for a complete list of error codes.

@pre This method can be called if @p scip is in one of the following stages: - \ref SCIP_STAGE_PROBLEM - \ref SCIP_STAGE_TRANSFORMING - \ref SCIP_STAGE_INITPRESOLVE - \ref SCIP_STAGE_PRESOLVING - \ref SCIP_STAGE_EXITPRESOLVE - \ref SCIP_STAGE_PRESOLVED - \ref SCIP_STAGE_SOLVING

@note the variable gets captured, hence at one point you have to release it using the method SCIPreleaseVar()