java编程基础习题

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1、武汉理工大学软件1003班伍诗昳Java编程基础习题题1：解任意系数一元二次方程：程序代码如下：packagealgebra.root;publicclassROOT{privatedoublea,b,c,x1,x2;publicROOT(doublea1,doubleb1,doublec1){a=a1;b=b1;c=c1;}publicvoidCalculate2Roots(){doubled;d=b*b-4*a*c;if(d>=0){x1=(-b+Math.sqrt(d))/(2*a);x2=(-b-Math.sqrt(d))/(2*a);System.

2、out.println("x1="+x1+""+"x2="+x2);}elseSystem.out.println("Norealroots.");}}packagealgebra.all;importalgebra.root.*;publicclassRootFinding{publicstaticvoidmain(Stringargs[]){doublea,b,c;a=Double.parseDouble(args[0]);b=Double.parseDouble(args[1]);c=Double.parseDouble(args[2]);ROOT

3、rt=newROOT(a,b,c);rt.Calculate2Roots();}}结果截图：题2：求前十个孙子数提示：若x%3=2,x%5=3,x%7=5,则x为孙子数程序代码如下：packagecalculate.number;publicclassNUMBER{privateintnum[];publicNUMBER(){num=newint[10];}publicvoidCalculate(){intn,count;for(n=1,count=0;count<10;n++){if(n%3==2&&n%5==3&&n%7==5)num[count++]=

4、n;}}publicvoidPrint(){for(inti=0;i<10;i++)System.out.println(num[i]);}}packagecalculate.all;importcalculate.number.*;publicclassCalculate10Number{publicstaticvoidmain(Stringargs[]){NUMBERsunzi=newNUMBER();sunzi.Calculate();sunzi.Print();}}结果截图：题3：求三个数的最大值和最小值程序代码如下：packageevaluatio

5、n.maxmin;publicclassMaxMin{privatedoublea,b,c,max,min;publicMaxMin(doublea1,doubleb1,doublec1){a=a1;b=b1;c=c1;}publicvoidMax(){if(a>b){if(a>c)max=a;elsemax=c;}elseif(b>c)max=b;elsemax=c;}publicvoidMin(){if(a

6、ystem.out.println("Max="+max+""+"Min="+min);}}packageevaluation.all;importevaluation.maxmin.*;publicclassEVALUATE{publicstaticvoidmain(Stringargs[]){doublea,b,c;a=Double.parseDouble(args[0]);b=Double.parseDouble(args[1]);c=Double.parseDouble(args[2]);MaxMinmm=newMaxMin(a,b,c);mm.

7、Max();mm.Min();mm.Print();}}结果截图：题4：计算N！方法1：循环程序代码如下：packagecalculate.factorial;publicclassFACTORIAL{privateintN;privatelongFac;publicFACTORIAL(intn){N=n;Fac=1;}publicvoidCalFac(){for(inti=N;i>0;i--)Fac=Fac*i;System.out.println(N+"!="+Fac);}}packagecalculate.all;importcalculate.fac

8、torial.*;publicclassCALCUL