软件工程个人作业02
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写一个能自动生成三十道小学四则运算题目的 “软件”,新的要求: 可以控制下列参数: 是否有乘除法; 是否有括号(最多可以支持十个数参与计算); 数值范围; 加减有无负数; 除法有无余数!
程序设计思想:
将要求的功能分别封装成类,在主函数中进行调用实现要求的功能。目前未能实现约分和多则运算,正在努力改进。
源代码:
package yunsuan; import java.util.Scanner; public class yunsuan { public static void main(String[]args) { yunsuan a=new yunsuan(); System.out.println("请选择数值范围(最大值)"); Scanner in =new Scanner(System.in); int range=in.nextInt(); System.out.println("请选择有无负数(1 or 2)"); int choose1=in.nextInt(); System.out.println("请选择有无乘除法(1 or 2)"); Scanner in3=new Scanner(System.in); int choose2=in3.nextInt(); Scanner in1=new Scanner(System.in); System.out.println("请输入要打印的数量"); int m=in1.nextInt(); for(int n=0;n<m;n++) { char[] c1={\'+\',\'-\',\'*\',\'/\'}; int c=(int)(Math.random()*4); if(choose1==1&&choose2==1) { if(c1[c]==\'+\') { a.add(range); } else if(c1[c]==\'-\') { a.jian2(range); } else if(c1[c]==\'*\') { a.chen(range); } else if(c1[c]==\'/\') { a.chu1(range); } } else if((choose1==1&&choose2==2)) { if(c1[c]==\'+\') { a.add(range); } else if(c1[c]==\'-\') { a.jian2(range); } else if(c1[c]==\'*\') { m++; } else if(c1[c]==\'/\') { m++; } } else if((choose1==2&&choose2==2)) { if(c1[c]==\'+\') { a.add(range); } else if(c1[c]==\'-\') { a.jian1(range); } else if(c1[c]==\'*\') { m++; } else if(c1[c]==\'/\') { m++; } } else if((choose1==2&&choose2==1)) { if(c1[c]==\'+\') { a.add(range); } else if(c1[c]==\'-\') { a.jian1(range); } else if(c1[c]==\'*\') { a.chen(range); } else if(c1[c]==\'/\') { a.chu1(range); } } } } public void add(int range) { int answer=0; int x=getrandom(range); int y=getrandom(range); System.out.print(x); System.out.print(\'+\'); System.out.print(y); System.out.print("="); System.out.println(); System.out.println("请输入答案:"); Scanner in2=new Scanner(System.in); int q=in2.nextInt(); answer= x+ y; System.out.println(answer); if(q==answer) { System.out.println("回答正确!"); } else System.out.println("回答错误!"); } public void jian1(int range) { int answer=0; int x=getrandom(range); int y=getrandom(range); if( x> y) { System.out.print(x); System.out.print(\'-\'); System.out.print(y); System.out.print("="); System.out.println(); System.out.println("请输入答案:"); Scanner in2=new Scanner(System.in); int q=in2.nextInt(); answer=x-y; if(q==answer) { System.out.println("回答正确!"); } else System.out.println("回答错误!"); } } public void jian2(int range) { int answer=0; int x=getrandom(range); int y=getrandom(range); System.out.print(x); System.out.print(\'-\'); System.out.print(y); System.out.print("="); System.out.println(); System.out.println("请输入答案:"); Scanner in2=new Scanner(System.in); int q=in2.nextInt(); answer= x- y; System.out.println(answer); if(q==answer) { System.out.println("回答正确!"); } else System.out.println("回答错误!"); } public void chu1(int range) { int answer=0; int x=getrandom(range); int y=getrandom(range); System.out.print(x); System.out.print(\'/\'); System.out.print(y); System.out.print("="); System.out.println(); System.out.println("请输入答案:"); Scanner in2=new Scanner(System.in); int q=in2.nextInt(); answer= x/y; System.out.println(answer); if(q==answer) { System.out.println("回答正确!"); } else System.out.println("回答错误!"); } public void chen2(int range) { int answer=0; int x=getrandom(range); int y=getrandom(range); if(x<y) { System.out.print(x); System.out.print(\'*\'); System.out.print(y); System.out.print("="); System.out.println(); System.out.println("请输入答案:"); Scanner in2=new Scanner(System.in); int q=in2.nextInt(); answer= x*y; System.out.println(answer); if(q==answer) { System.out.println("回答正确!"); } else System.out.println("回答错误!"); } } public void chen(int range) { int answer=0; int x=getrandom(range); int y=getrandom(range); System.out.print(x); System.out.print(\'*\'); System.out.print(y); System.out.print("="); System.out.println(); System.out.println("请输入答案:"); Scanner in2=new Scanner(System.in); int q=in2.nextInt(); answer= x*y; System.out.println(answer); if(q==answer) { System.out.println("回答正确!"); } else System.out.println("回答错误!"); } public int getrandom(int range) { int x=(int) ( Math.random() * range ); return x; } }
程序截图:
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