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int sym_is_integer(sym_environment *env, int index, int *value)
This routine is used to ask whether the queried variable is integer.
| sym_environment *env | IN | Pointer to the SYMPHONY environment. |
| int index | IN | Index of the queried variable. Note that, it has to be at most the number of columns. |
| int *value | OUT | Pointer to a boolean indicating the variable status. |
| FUNCTION_TERMINATED_ABNORMALLY | Function invoked unsuccessfully. |
| FUNCTION_TERMINATED_NORMALLY | Function invoked successfully. |