1.7 TRAINING

• Look carefully at the given functions:
 

Example 1.21: test1

FUNCTION test1,minimum=min_val

    IF KEYWORD_SET(min_val) THEN RETURN,1 ELSE RETURN,0

  END

  

Example 1.22: test2

FUNCTION test2,minimum=min_val

    IF ARG_PRESENT(min_val) THEN RETURN,1 ELSE RETURN,0

  END

  

Example 1.23: test3

FUNCTION test3,minimum=min_val

    IF N_ELEMENTS(min_val) GT 0 THEN RETURN,1 ELSE RETURN,0

  END

  


Your results:
 

call: test1 test2 test3 PRINT, testX( ) PRINT, testX(minimum=0) PRINT, testX(minimum=10) PRINT, testX(minimum=-10) mv=0 & PRINT, testX(minimum=mv) mv=10 & PRINT, testX(minimum=mv) PRINT, testX(minimum=mv)