COBOL Compute语句

IDENTIFICATION DIVISION.
PROGRAM-ID. HELLO.

DATA DIVISION.
   WORKING-STORAGE SECTION.
   01 WS-NUM1 PIC 9(9) VALUE 10 .
   01 WS-NUM2 PIC 9(9) VALUE 10.
   01 WS-NUM3 PIC 9(9) VALUE 10.
   01 WS-NUMA PIC 9(9) VALUE 50.
   01 WS-NUMB PIC 9(9) VALUE 10.
   01 WS-NUMC PIC 9(9).

PROCEDURE DIVISION.
   COMPUTE WS-NUMC= (WS-NUM1 * WS-NUM2) - (WS-NUMA / WS-NUMB) + WS-NUM3.
   DISPLAY "WS-NUM1     : " WS-NUM1
   DISPLAY "WS-NUM2     : " WS-NUM2
   DISPLAY "WS-NUM3     : " WS-NUM3
   DISPLAY "WS-NUMA     : " WS-NUMA
   DISPLAY "WS-NUMB     : " WS-NUMB
   DISPLAY "WS-NUMC     : " WS-NUMC

STOP RUN.