How to Ensure Accurate Velocity Calculation as a Float in Java?

How to Calculate Velocity as a Float

When working with integers, dividing two numbers usually results in another integer, truncating any decimal values. However, when calculating velocity, which is often expressed as a floating point value, it's essential to obtain a float result.

In the provided Java code:

class CalcV {
  float v;
  float calcV(int s, int t) {
    v = s / t;
    return v;
  }
}

The division between s and t results in an integer value. To produce a float, we need to coerce one of the operands to a floating point value.

Solution: Cast an Operand to Float

Casting the integer operand s to a float before performing the division forces the entire operation to be a floating point calculation.

v = (float)s / t;

This cast takes precedence over the division, ensuring that the s value is treated as a float even though t is an integer. According to the Java Language Specification (§4.2.4 and §15.17), if one operand is a floating point type, the operation becomes a floating point operation, automatically casting the other operand to a float.

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