《Java语言程序设计(基础篇)》(第10版梁勇著)第三章练习题答案.pdfVIP

《Java语言程序设计（基础篇）》（第10版梁勇著）第三章

练习题答案

《Java语言程序设计（基础篇）》（第10版梁勇著）

第三章练习题答案

3.1

publicclassExercise03_01{

publicstaticvoidmain(String[]args){

Scannerinput=newScanner(System.in);

System.out.print(Entera,b,c:);

doublea=input.nextDouble();

doubleb=input.nextDouble();

doublec=input.nextDouble();

doublediscriminant=b*b-4*a*c;

if(discriminant0){

System.out.println(Theequationhasnorealroots);

}

elseif(discriminant==0){

doubler1=-b/(2*a);

System.out.println(Theequationhasoneroot+r1);

}

else{//(discriminant0)

doubler1=(-b+Math.pow(discriminant,0.5))/(2*a);

doubler2=(-b-Math.pow(discriminant,0.5))/(2*a);

System.out.println(Theequationhastworoots+r1+and

+r2);

}

}

}

3.1附加

publicclassExercise03_01Extra{

publicstaticvoidmain(Stringargs[]){

Scannerinput=newScanner(System.in);

System.out.print(Enteranumerator:);

intnumerator=input.nextInt();

System.out.print(Enteradenominator:);

intdenominator=input.nextInt();

if(numeratordenominator){

System.out.println(numerator+/+denominator+isa

properfraction);

}

elseif(numerator%denominator==0){

System.out.print(numerator+/+denominator+isan

improperfraction);

System.out.println(anditcanbereducedto+numerator/

denominator);

}

else{

System.out.print(numerator+/+denominator+isan

improperfraction);

System.out.println(anditsmixedfractionis+numerator/

denominator+++

numerator%denominator+/+denominator);

}

}

}

3.2

publicclassExercise03_02{

publicstaticvoidmain(String[]args){

Scannerinput=newScanne