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How to fix bad operand types for binary operator?

 
Greenhorn
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I have several class for my CourseGrades class. I'm trying to find out average of them and the lowest & the highest number among them.
Can anyone please help me with this? I'm getting following error msg:

CourseGrades.java:34: error: inconvertible types
total += (double)(grades[i]);
^
required: double
found: GradedActivity
CourseGrades.java:45: error: bad operand types for binary operator '>'
if ((grades[0]>grades[1])&& (grades[0]>grades[2]) && (grades[0]>grades[3]))
^
first type: GradedActivity
second type: GradedActivity
CourseGrades.java:45: error: bad operand types for binary operator '>'
if ((grades[0]>grades[1])&& (grades[0]>grades[2]) && (grades[0]>grades[3]))
^
first type: GradedActivity
second type: GradedActivity
CourseGrades.java:45: error: bad operand types for binary operator '>'
if ((grades[0]>grades[1])&& (grades[0]>grades[2]) && (grades[0]>grades[3]))
^
first type: GradedActivity
second type: GradedActivity
CourseGrades.java:47: error: bad operand types for binary operator '>'
else if ((grades[1]>grades[0])&& (grades[1]>grades[2]) && (grades[1]>grades[3]))
^
first type: GradedActivity
second type: GradedActivity
CourseGrades.java:47: error: bad operand types for binary operator '>'
else if ((grades[1]>grades[0])&& (grades[1]>grades[2]) && (grades[1]>grades[3]))




//***********************************************************************
[Fixed code tags and formatted - see UseCodeTags for details]
 
Bartender
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Hi Aunu. Welcome to the Ranch!

It looks like you're trying to cast a GradedActivity object (which is what grades[i] is) to a double. Why would you expect that to work? Presumably you intend that to be the score of the GradedActivity?

The same elsewhere - you're trying to use an object as if it was a number.
 
Marshal
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Welcome again

I think you need a new way to iterate the array and find which is the largest; it is a standard beginner's exercise and quite simple to implement. Those multiple ifs are inelegant, I am afraid, and potentially error‑prone.
 
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