Java大学基础教程(英文第六版)课后第六章自测题答案
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//test the 'Math' class
//Math class is a part of ng package, so no need to import it publicclass p217_6$3 {
/**
* @param args
*/
publicstaticvoid main(String[] args) {
// TODO Auto-generated method stub
System.out.printf("Math.abs( 23.7 ) = %s\n", Math.abs( 23.7 ) );
System.out.printf("Math.abs( 23.7 ) = %f\n", Math.abs( 23.7 ) );
System.out.printf("Math.abs( 0.0 ) = %f\n", Math.abs( 0.0 ) );
System.out.printf("Math.abs( -23.7 ) = %f\n", Math.abs( -23.7 ) );
System.out.printf("Math.ceil( 9.2 ) = %f\n", Math.ceil( 9.2 ) );
System.out.printf("Math.ceil( -9.8 ) = %f\n", Math.ceil( -9.8 ) );
System.out.printf("Math.cos( 0.0 ) = %f\n", Math.cos( 0.0 ) );
System.out.printf("Math.exp( 1.0 ) = %f\n", Math.exp( 1.0 ) );
System.out.printf("Math.exp( 2.0 ) = %f\n", Math.exp( 2.0 ) );
System.out.printf("Math.floor( 9.2 ) = %f\n", Math.floor( 9.2 ) );
System.out.printf("Math.floor( -9.8 ) = %f\n",
Math.floor( -9.8 ) );
System.out.printf("Math.log( Math.E ) = %f\n",
Math.log(Math.E ) );
System.out.printf("Math.log( Math.E * Math.E ) = %f\n",
Math.log(Math.E * Math.E ) );
System.out.printf("Math.max( 2.3, 12.7 ) = %f\n",
Math.max( 2.3, 12.7 ) );
System.out.printf("Math.max( -2.3, -12.7 ) = %f\n",
Math.max( -2.3, -12.7 ) );
System.out.printf("Math.min( 2.3, 12.7 ) = %f\n",
Math.min( 2.3, 12.7 ) );
System.out.printf("Math.min( -2.3, -12.7 ) = %f\n",
Math.min( -2.3, -12.7 ) );
System.out.printf("Math.pow( 2.0, 7.0 ) = %f\n",
Math.pow( 2.0, 7.0 ) );
System.out.printf("Math.pow( 9.0, 0.5 ) = %f\n",
Math.pow( 9.0, 0.5 ) );
System.out.printf("Math.sin( 0.0 ) = %f\n", Math.sin( 0.0 ) );
System.out.printf("Math.sqrt( 900.0 ) = %f\n",
Math.sqrt( 900.0 ) );
System.out.printf("Math.tan( 0.0 ) = %f\n", Math.tan( 0.0 ) );
}
}
import java.util.Scanner;
publicclass p218_6$6a {
/**
* @param args
*/
publicstaticvoid main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
System.out.print("input the radius of a sphere:\n");
double r = input.nextDouble();
p218_6$6b compute = new p218_6$6b();
//compute area
double area = puteArea(r);
System.out.printf("\nthe AREA of a sphere is: %f\n", area);
//compute volume
double volume = puteVolume(r);
System.out.printf("\nthe VOLUME of a sphere is: %f\n", volume);
}
}
publicclass p218_6$6b {
publicdouble computeArea(double r){
double area = Math.PI * Math.pow(r, 2) ;
return area;
}
publicdouble computeVolume(double r){
double volume = (4/3) * Math.PI * Math.pow(r, 3);
return volume;
}
}