88 lines
2.1 KiB
Java
88 lines
2.1 KiB
Java
public class Approx {
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private double value;
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private double error;
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public Approx(){this.value = this.error = 0;}
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public Approx(Approx b){
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this.value = b.value;
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this.error = b.error;
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}
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public Approx(double value, double error){
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this.value = value;
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this.error = error;
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}
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public Approx add(Approx b){
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value+= b.value;
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error = Math.sqrt(error * error + b.error * b.error);
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return this;
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}
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public Approx add(double b){
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value+= b;
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return this;
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}
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public Approx sub(Approx b){
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value-= b.value;
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error = Math.sqrt(error * error + b.error * b.error);
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return this;
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}
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public Approx sub(double b){
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value-= b;
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return this;
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}
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public Approx mult(Approx b){
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double oldVal = value;
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value*= b.value;
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error = Math.sqrt(value * value * (error*error) / (oldVal*oldVal) +
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(b.error*b.error) / (b.value*b.value));
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return this;
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}
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public Approx mult(double b){
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value*= b;
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error = Math.abs(b * error);
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return this;
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}
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public Approx div(Approx b){
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double oldVal = value;
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value/= b.value;
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error = Math.sqrt(value * value * (error*error) / (oldVal*oldVal) +
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(b.error*b.error) / (b.value*b.value));
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return this;
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}
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public Approx div(double b){
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value/= b;
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error = Math.abs(b * error);
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return this;
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}
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public Approx pow(double b){
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double oldVal = value;
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value = Math.pow(value, b);
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error = Math.abs(value * b * (error / oldVal));
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return this;
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}
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@Override
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public String toString(){return value+"±"+error;}
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public static void main(String[] args){
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Approx x1 = new Approx(100, 1.1);
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Approx y1 = new Approx(50, 1.2);
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Approx x2 = new Approx(200, 2.2);
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Approx y2 = new Approx(100, 2.3);
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x1.sub(x2).pow(2).add(y1.sub(y2).pow(2)).pow(0.5);
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System.out.println(x1);
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}
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}
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