* @param num The rank of constraint we want to get
* @return The numth constraint
*/
-XBT_PUBLIC(lmm_constraint_t) lmm_get_cnst_from_var(lmm_system_t sys, lmm_variable_t var, int num);
+XBT_PUBLIC(lmm_constraint_t) lmm_get_cnst_from_var(lmm_system_t sys, lmm_variable_t var, unsigned num);
/**
* @brief Get the weigth of the numth constraint associated to the variable
* @param num The rank of constraint we want to get
* @return The numth constraint
*/
-XBT_PUBLIC(double) lmm_get_cnst_weight_from_var(lmm_system_t sys, lmm_variable_t var, int num);
+XBT_PUBLIC(double) lmm_get_cnst_weight_from_var(lmm_system_t sys, lmm_variable_t var, unsigned num);
/**
* @brief Get the number of constraint associated to a variable