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javaarraystypesprimitiveprimitive-types

Array element point float getting truncated

Double happens:

double ages[] = new double[] {2D, 3D, 4D, 5D};
ages[0] = 7/2; 

Index  Element
0      3.0    
1      3.0
2      4.0
3      5.0

Makes sense because:

7 int / 2 int = 3 int

But when it gets appended at the final the suffix D or F to ages[0] = 7/2;, INDEX 0 appears with decimals even when we are dividing integers:

double ages[] = new double[] {2D, 3D, 4D, 5D};
ages[0] = 7/2D; 

Index  Element
0      3.5
1      3.0
2      4.0
3      5.0

Why its getting truncated even if the suffix D suppose to be "OPTIONAL"?

Solution

  • 7 / 2 is the int/int operation and therefore the result is 3. When you assign it to a float or double variable, it will become 3.0.