I am new to Java. I want to print out the sin, cos and tan values for every 15 degree interval.
public class W3Aufgabe5 {
public static void main(String[] args) {
System.out.printf("%6s%6s%6s%6s%n", "Angle", "Sin", "Cos", "Tan");
System.out.println("------------------------");
for (float angle = 0; angle <= 180; angle += 15) {
float sin = Math.sin(Math.toRadians(angle));
float cos = Math.cos(Math.toRadians(angle));
float tan = Math.tan(Math.toRadians(angle));
System.out.printf("%6d%6d%6d%6d%n", angle, sin, cos, tan);
}
}
}
For every Math.x() line, the compiler prints
error: possible loss of precision
required: float
found: double
I don't really understand. Why does it require double even though I am using float all the time?
The trigonometric methods sin, cos, tan, and toRadians all accept double as a parameter and return double. There are no overloads that accept floats and return floats. It's legal to pass a float to a method expecting a double; it will be widened implicitly. But you can't narrow a double to a float implicitly when you assign the results to floats.
You can explicitly cast the results to float if you want, but you get better precision with double, so declare your sin, cos, and tan variables as doubles.
Also, the format specifier d means integer values, not floating point values. Use the format specifier f instead of d. You may also want to place some spacing in between your values when you print them.
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