设计思想：在四则运算01的基础上添加乘除、括号、数值范围、负数、和余数。
是否乘除：用1234代替+-*/，fuhao = (int)(1+(Math.random()*num),num = 2表示无乘除，num = 2表示有乘除。
是否括号：先写出一个四则运算混合表达式：第一个数随机给出，然后在for循环中随机取得符号（符号范围：+ ，-， *， /， +（，-（，*（，/（ 这8个）和数字，并连起来成为一个表达式。在求出表达式的值。
数值范围：设置num_max,num_min确定范围
有无负数：若选择没有负数，两个数在相减之前，判断一下大小就好了
有无余数：若选择有余数，结果输出 a/b+""+a%b
2、源程序代码：
package 四则运算2;
import java.util.Scanner;
public class Test {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
Scanner in = new Scanner(System.in);
System.out.println("请输入题目的数量：");
int n = in.nextInt();
System.out.println("请输入每行题目的数目：");
int num= in.nextInt();
//乘除法
System.out.println("请输入题目是否包含乘除法：1、有 2、没有");
int j = in.nextInt();
int k;//控制运算符号的数目，k=2没有乘除，反之有乘除
if(j==1)
{
k = 3;
}
else
k = 1;
//是否有括号
System.out.println("请输入题目是否包含括号：1、有 2、没有");
int if_kuohao = in.nextInt();
//控制数值范围
System.out.println("请输入题目数值的最大范围：");
int num_max = in.nextInt();
System.out.println("请输入数值的最小范围：");
int num_min = in.nextInt();
System.out.println( "请输入加减结果是否允许有负数：1、有负数 2、没有负数");
int ifFushu = in.nextInt();
System.out.println( "请输入除法结果是否允许有余数(如：5/4= 1...1)：1、有余数 2、没有余数");
int ifYushu = in.nextInt();
yunsuan(in,n,num,k,num_max,num_min,ifFushu,ifYushu,if_kuohao);
in.close();
}
//分数化简
public static String huajian(int a,int b){
if(a<b)
{
for(int i = a;i>0;i--){
if(a%i==0&&b%i==0){
a/=i;
b/=i;
break;
}}
if(a%b==0)
return a/b+"";
else
return a+"/"+b;
}
else{
for(int i = b;i>0;i--){
if(a%i==0&&b%i==0){
a/=i;
b/=i;
break;
}}
if(b%a==a)
return b/a+"";
else
return b+"/"+a;
}
}
public static String yushu(int a,int b){
if(a%b==0)
return a/b+"";
else if(b%a==a)
return b/a+"";
else
return a/b+"..."+a%b;
}
public static float opt(String s) throws Exception{
if(s == null || "".equals(s.trim())) {
return 0f;
}
int a1=s.indexOf("+");
int a2=s.indexOf("-");
int a3=s.indexOf("*");
int a4=s.indexOf("/");
int a5=s.indexOf("(");
if(a1==-1&&a2==-1&&a3==-1&&a4==-1){
if(s.trim()==null||"".equals(s.trim())){
throw new Exception("operate error");
}
return Float.parseFloat(s.trim());
}
if(a5!=-1){
int a6=s.indexOf(")");
if(a6==-1){
throw new Exception("括号不匹配");
}else{
float f=opt(s.substring(a5+1,a6).trim());
s=s.replace(s.substring(a5,a6+1), String.valueOf(f));
return opt(s);
}
}
if(a1!=-1){
return opt(s.substring(0,a1))+opt(s.substring(a1+1,s.length()));
}
if(a2!=-1){
return opt(s.substring(0,a2))-opt(s.substring(a2+1,s.length()));
}
if(a3!=-1){
return opt(s.substring(0,a3))*opt(s.substring(a3+1,s.length()));
}
if(a4!=-1){
return opt(s.substring(0,a4))/opt(s.substring(a4+1,s.length()));
}
return Integer.parseInt(s.trim());
}
//n为数的个数，
public static float kuohao(int n,int num_max,int num_min) throws Exception{
int x=(int) (1+(Math.random()*num_max));
while(x<num_min)
x = (int)(1+(Math.random()*num_min));
int y=0;//符号随机
int j;//寻找（
int p;//确定）的位置
int e=0;//确定表达式中是否有右括号
int a = 10;
String f = null ;
String biaodashi = x+"";
int num = 8;
for(int i = 0;i<5-1;i++){
y = (int)(1+(Math.random()*num));
if(y==1)
f = "+";
else if(y==2)
f = "-";
else if(y==3)
f = "*";
else if(y==4)
f = "/";
else if(y==5)
f = "+(";
else if(y==6)
f = "-(";
else if(y==7)
f = "*(";
else if(y==8)
f = "/(";
biaodashi = biaodashi+ f + x ;
x=(int)(1+(Math.random()*20));
//控制左括号
if(y>4)
{
num = 4;
a = i;
}
else if(4-i>0)
num = 4;
//控制右括号
if(i-a>=1&&e==0)
{
p=(int)(1+(Math.random()*2));
if(p==1)
biaodashi+="";
else
{
biaodashi+=")";
e=1;
}
}
}
for(int q = 0;q<biaodashi.length();q++){
if(biaodashi.charAt(q)=='(')
for(int w = q;w<biaodashi.length();w++)
if(biaodashi.charAt(w)==')')
break;
else
{
if(w==biaodashi.length()-1)
biaodashi+=")";
}
}
System.out.print(biaodashi+" ");
float as = opt(biaodashi);
return as;
}
//分数四则运算
public static String[] fenshu(int n,int num,int num_max,int num_min,
int fuhao_num,int ifYushu,int ifFushu){
System.out.println("
分数四则运算：");
String result1[] = new String[n];
for(int i1 = 0;i1<n;i1++)
{
int a =1+ (int)(Math.random()*num_max);
int b = 1+(int)(Math.random()*num_max);
int c = 1+(int)(Math.random()*num_max);
int d = 1+(int)(Math.random()*num_max);
while(a<num_min){
a=1+ (int)(Math.random()*num_max);
}
while(b<num_min){
b=1+ (int)(Math.random()*num_max);
}
while(c<num_min){
c=1+ (int)(Math.random()*num_max);
}
while(d<num_min){
d=1+ (int)(Math.random()*num_max);
}
int e;
int fuhao1 = 1+(int)(Math.random()*fuhao_num);
if(a>b)
{
e = a;
a = b;
b = e;
}
if(c>d)
{
e = c;
c = d;
d = e;
}
String x1 = a+"/"+b;
String y1 = c+"/"+d;
System.out.print((i1+1+n)+": ");
if(fuhao1 == 0&&ifYushu == 1){
System.out.print(x1+ " + " +y1+" ");
a = a*d+b*c;
b = b*d;
result1[i1] = yushu(a,b);
}
else if(fuhao1 == 0&&ifYushu == 2)
{
System.out.print(x1+ " + " +y1+" ");
a = a*d+b*c;
b = b*d;
result1[i1] = huajian(a,b);
}
else if(fuhao1 == 1&&ifYushu==1)
{
//有负数
if(ifFushu==1){
System.out.print(y1+ " - " +x1+" ");
a = b*c-a*d;
b = b*d;
result1[i1] = yushu(a,b);
}
}
//没有负数
if(ifFushu==2){
if(a/b<c/d)
{
System.out.print(y1+ " - " +x1+" ");
a = b*c-a*d;
b = b*d;
result1[i1] = yushu(a,b);
}
else
{
System.out.print(x1+ " - " +y1+" ");
a = a*d-b*c;
b = b*d;
result1[i1] = yushu(a,b);
}
}
else if(fuhao1 == 1&&ifYushu==2)
{
//有负数
if(ifFushu==1){
System.out.print(y1+ " - " +x1+" ");
a = b*c-a*d;
b = b*d;
result1[i1] = huajian(a,b);
}
//没有负数
if(ifFushu==2){
if(a/b<c/d)
{
System.out.print(y1+ " - " +x1+" ");
a = b*c-a*d;
b = b*d;
result1[i1] = huajian(a,b);
}
else
System.out.print(x1+ " - " +y1+" ");
a = a*d-b*c;
b = b*d;
result1[i1] = huajian(a,b);}
}
else if(fuhao1 ==2&&ifYushu==1){
System.out.print(x1+ " * " +y1+" ");
a = a*c;
b = b*d;
result1[i1] = yushu(a,b);
}
else if(fuhao1 ==2&&ifYushu==2){
System.out.print(x1+ " * " +y1+" ");
a = a*c;
b = b*d;
result1[i1] = huajian(a,b);
}
else if(fuhao1 ==3&&ifYushu==1){
System.out.print(x1+ " / " +y1+" ");
a = a*d;
b = b*c;
result1[i1] = yushu(a,b);
}
else if(fuhao1 ==3&&ifYushu==2){
System.out.print(x1+ " / " +y1+" ");
a = a*d;
b = b*c;
result1[i1] = huajian(a,b);
}
if((i1+1)%num==0)
System.out.print("
");
}
return result1;
}
//四则运算 fuhao_num控制乘除，num_max num_min控制数值范围，c控制是否有负数，d控制是否有余数
public static void yunsuan(Scanner in,int n,int num,int fuhao_num,
int num_max,int num_min,int ifFushu,int ifYushu,int if_kuohao) throws Exception{
int result[] = new int[n];
String result1[] = new String[n];
String aq[] = new String[n];
if(if_kuohao==2){
//整数四则运算
System.out.println("整数四则运算：");
for(int i = 0;i<n/2;i++){
//获得两个数
int x =1+ (int)(Math.random()*num_max);
int y = 1+(int)(Math.random()*num_max);
while(x<num_min){
x =1+ (int)(Math.random()*num_max);
}
while(y<num_min)
{
y = 1+ (int)(Math.random()*num_max);
}
//随机获得符号
int fuhao = 1+(int)(Math.random()*fuhao_num);
System.out.print(i+1+": ");
//加法运算
if(fuhao == 0)
{
System.out.print(x+ " + " +y+" ");
result[i] = x+y;
}
//减法运算并检验结果无负数
else if(fuhao == 1&&ifFushu ==2)
{
if(x<y)
{
System.out.print(y+ " - " +x+" ");
result[i] = y-x;
}
else
{
System.out.print(x+ " - " +y+" ");
result[i] = x-y;
}
}
//减法运算结果有负数
else if(fuhao == 1&&ifFushu == 1)
{
System.out.print(x+ " - " +y+" ");
result[i] = x-y;
}
//乘法运算
else if(fuhao ==2){
System.out.print(x+ " * " +y+" ");
result[i] = x*y;
}
//除法运算并判断结果有无余数
else
{
if(ifYushu == 2){
System.out.print(x+ " / " +y+" ");
result1[i] = huajian(x,y);
}
else
{
System.out.print(x+ " / " +y+" ");
result1[i] = x/y+"..."+x%y;
}
}
//判断每行的题数
if((i+1)%num ==0)
{
System.out.println();
}
}
//分数四则运算
aq=fenshu(n/2,num,num_max, num_min,fuhao_num, ifYushu, ifFushu);
for(int j = n/2;j<n;j++){
result1[j] = aq[j-n/2];
}
System.out.println("若做完，按1可查看答案");
int number = in.nextInt();
in.close();
int a = 0;
if(number == 1){
for(int i1= 0;i1<n;i1++){
System.out.print(i1+1+":");
if(result1[i1]!=null){
System.out.print(result1[i1]+" ");
}
else
System.out.print(result[i1]+" ");
a++;
if(a%5==0)
System.out.print("
");
}
}
}
//带括号的运算
if(if_kuohao==1){
System.out.println("
整数四则运算");
for(int i = 0;i<n/3;i++){
//获得两个数
int x =1+ (int)(Math.random()*num_max);
int y = 1+(int)(Math.random()*num_max);
while(x<num_min){
x =1+ (int)(Math.random()*num_max);
}
while(y<num_min)
{
y = 1+ (int)(Math.random()*num_max);
}
//随机获得符号
int fuhao = 1+(int)(Math.random()*fuhao_num);
System.out.print(i+1+": ");
//加法运算
if(fuhao == 0)
{
System.out.print(x+ " + " +y+" ");
result[i] = x+y;
}
//减法运算并检验结果无负数
else if(fuhao == 1&&ifFushu ==2)
{
if(x<y)
{
System.out.print(y+ " - " +x+" ");
result[i] = y-x;
}
else
{
System.out.print(x+ " - " +y+" ");
result[i] = x-y;
}
}
//减法运算结果有负数
else if(fuhao == 1&&ifFushu == 1)
{
System.out.print(x+ " - " +y+" ");
result[i] = x-y;
}
//乘法运算
else if(fuhao ==2){
System.out.print(x+ " * " +y+" ");
result[i] = x*y;
}
//除法运算并判断结果有无余数
else
{
if(ifYushu == 2){
System.out.print(x+ " / " +y+" ");
result1[i] = huajian(x,y);
}
else
{
System.out.print(x+ " / " +y+" ");
result1[i] = x/y+"..."+x%y;
}
}
//判断每行的题数
if((i+1)%num ==0)
{
System.out.println();
}
}
//分数四则运算
aq=fenshu(n/3,num,num_max, num_min,fuhao_num, ifYushu, ifFushu);
for(int j = n/3;j<n/3*2;j++){
result1[j] = aq[j-n/3];
}
//括号四则运算
float[] as = new float[n];
System.out.println("
括号四则运算：");
for(int i = n/3*2;i<n;i++){
System.out.print(i+1+":");
as[i] = kuohao(num,num_max,num_min);
if(i%num==0)
System.out.print("
");
}
System.out.println("若做完，按1可查看答案");
int number1 = in.nextInt();
in.close();
int a1 = 0;
if(number1 == 1){
for(int i1= 0;i1<n;i1++){
System.out.print(i1+1+":");
if(result1[i1]!=null&&i1<n/3*2){
System.out.print(result1[i1]+" ");
}
else if(i1<n/3*2)
System.out.print(result[i1]+" ");
else if(i1>=n/3*2)
System.out.println(as[i1]);
a1++;
if(a1%5==0)
System.out.print("
");
}
}
}
}
}
3、程序截图：
