02运算符、表达式、流程控制

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1、1、完成5!的计算packagecom.softeem.HomeWork;/***阶乘*/publicclassMultiply{publicstaticvoidmain(String[]args){inti;intj=1;for(i=1;i<=5;i++){j=j*i;}System.out.println("结果="+j);}}2、统计inta=847574中位值为”1”的个数packagecom.softeem.HomeWork;/***统计已知数子二进制表示时的1的个数*@authorAdministrat

2、or**/publicclassStaticlice{publicstaticvoidmain(String[]args){inta=847574;intc=0;while(a!=1){if(a%2==1){c++;}a=a/2;}System.out.println(c+1);}}3、在屏幕上打印1-30个数，每7个数换行packagecom.softeem.HomeWork;/***输出三十个数，七个数一行打印出来*@authorAdministrator**/publicclassCount{publicst

3、aticvoidmain(String[]args){intj=0;for(inti=1;i<=30;i++){System.out.print(""+i);j++;if(j==7){System.out.println();j=0;}}}}4、打印1000以内的所有素数packagecom.softeem.HomeWork;/***实现在控制台输出1000以内的素数*@authorAdministrator**/publicclassPrime{publicstaticvoidmain(String[]args)

4、{intt=0;inti=2;System.out.print(""+i);for(i=3;i<=1000;i++){booleanf=true;for(intj=2;j

5、nistrator**/publicclassEvenNumber{publicstaticvoidmain(String[]args){System.out.print("1到10之间偶数为：");for(inti=1;i<=10;i++){if(i%2==0){System.out.print(i+"");}}}}6、九九乘法口诀表packagecom.softeem.HomeWork;/***打印输出乘法口诀表*@authorAdministrator**/publicclassKouJue{publicst

6、aticvoidmain(String[]args){inti;intj;intz;for(i=1;i<=9;i++){for(j=1;j<=i;j++){z=i*j;System.out.print(j+"*"+i+"="+z+"");}System.out.println();}}}7、编写一个if语句,根据inti的值(0-9,10-99,100-999)调用不同的方法do0_9(),do10_99(),do100_999();packagecom.softeem.HomeWork;importjava.ut

7、il.Scanner;publicclassTestDo{publicvoiddo0_9(){System.out.println("调用do0_9方法");}publicvoiddo10_99(){System.out.println("调用do10_99方法");}publicvoiddo100_999(){System.out.println("调用do100_999方法");}publicstaticvoidmain(String[]args){System.out.print("请输入一个数：");Sca

8、nnerscan=newScanner(System.in);TestDotf=newTestDo();intinput=scan.nextInt();if(input>=0&&input<=9){tf.do0_9();}elseif(input>=10&&input<=99){tf.do10_99();}elseif(input>=100&&input<=