Grade-Point-Average

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Float vs Int

In Java, any number written without a decimal point is assumed to be an integer (int) value.
As soon as there is a decimal point written, the number is a floating point (float) value.
Usually a float value is better than an int value, because:

• float values can be larger, up to 10³⁸
  
• float can have decimals, and will allow correct division operations

Practice

1. Calculate the average of the following ages:
     25 students are 15 years old
     45 students are 16 years old
     30 students are 17 years old
2. Add up the following:
     1+3
     1+3+5
     1+3+5+7
     ...
     1+3+5+7+....+97+99
   Is there a pattern?
3. Explain why adding up int values gives correct answers,
   but dividing int values gives incorrect answers.