📄 chapter04algrithm.pro
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; Chapter04Algrithm.pro
PRO Chapter04Algrithm
yn = " "
REPEAT BEGIN
READ, PROMPT = "请选择运算方式(1- 加, 2- 减, 3- 乘 ):", n
IF n EQ 1 || n EQ 2 || n EQ 3 THEN BEGIN
READ, PROMPT = "请输入X = ?", x
READ, PROMPT = "请输入Y = ?", y
CASE n OF
1: PRINT, x, '+', y, '=', Chapter04Plus(x, y)
2: PRINT, x, '-', y, '=', Chapter04Minus(x, y)
3: PRINT, x, '*', y, '=', Chapter04Product(x, y)
ENDCASE
ENDIF ELSE BEGIN
PRINT, " 选择运算方式错误!"
ENDELSE
READ, PROMPT = "继续计算吗?(Y or N):", yn
yn = STRUPCASE(yn)
ENDREP UNTIL yn NE "Y"
END
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