四则运算 一

问题：

实现自动生成三十道四则运算的题目，要求：除整数外还要支持真分数的四则运算。

源程序：

import java.util.Scanner;
public class YunSuan {

public static void main(String[] args) {
// TODO Auto-generated method stub

System.out.println("1.真分数运算 2.整数运算");
Scanner s=new Scanner(System.in);
System.out.println("please choose one mode");
int k = s.nextInt();

//zhenfenshu
if(k==1)
{
for(int i=0;i<30;i++)
{
// first number
int m = (int)(Math.random()*100);
int n = (int)(Math.random()*100);
// second number
int a = (int)(Math.random()*100);
int b = (int)(Math.random()*100);

int f = (int)(Math.random()*100);
//cut
if(f%4==0)
{
if(n==0||b==0)
{
int t1=0;
while(t1==0)
{
n = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(n!=0&&b!=0)
t1=1;
}
if(m>=n||a>=b)
{
int t2=0;
while(t2==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t2=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" - "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" - "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" - "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" - "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" - "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" - "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" - "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" - "+a+"/"+b+" = ");
}
else
{
if(m>=n||a>=b)
{
int t3=0;
while(t3==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t3=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" - "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" - "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" - "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" - "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" - "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" - "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" - "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" - "+a+"/"+b+" = ");
}
}

//add
else if(f%4==1)
if(n==0||b==0)
{
int t4=0;
while(t4==0)
{
n = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(n!=0&&b!=0)
t4=1;
}
if(m>=n||a>=b)
{
int t5=0;
while(t5==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t5=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" + "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" + "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" + "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" + "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" + "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" + "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" + "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" + "+a+"/"+b+" = ");
}
else
{
if(m>=n||a>=b)
{
int t6=0;
while(t6==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t6=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" + "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" + "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" + "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" + "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" + "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" + "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" + "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" + "+a+"/"+b+" = ");
}

//multiply
else if(f%4==2)
if(n==0||b==0)
{
int t7=0;
while(t7==0)
{
n = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(n!=0&&b!=0)
t7=1;
}
if(m>=n||a>=b)
{
int t8=0;
while(t8==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t8=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" * "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" * "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" * "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" * "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" * "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" * "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" * "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" * "+a+"/"+b+" = ");
}
else
{
if(m>=n||a>=b)
{
int t6=0;
while(t6==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t6=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" * "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" * "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" * "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" * "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" * "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" * "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" * "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" * "+a+"/"+b+" = ");
}

//divide
else if(f%4==3)
if(n==0||b==0)
{
int t9=0;
while(t9==0)
{
n = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(n!=0&&b!=0)
t9=1;
}
if(m>=n||a>=b)
{
int t0=0;
while(t0==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t0=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" / "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" / "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" / "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" / "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" / "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" / "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" / "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" / "+a+"/"+b+" = ");
}
else
{
if(m>=n||a>=b)
{
int t11=0;
while(t11==0)
{
m = (int)(Math.random()*100);
n = (int)(Math.random()*100);
a = (int)(Math.random()*100);
b = (int)(Math.random()*100);
if(m<n&&a<b)
t11=1;
}
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" / "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" / "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" / "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" / "+a+"/"+b+" = ");
}
else
//若分子为0 直接输出0
if(m==0&&a==0)
System.out.println("0"+" / "+"0"+" = ");
else if(m==0&&a!=0)
System.out.println("0"+" / "+a+"/"+b+" = ");
else if(m!=0&&a==0)
System.out.println(m+"/"+n+" / "+"0"+" = ");
else if(m!=0&&a!=0)
System.out.println(m+"/"+n+" / "+a+"/"+b+" = ");
}
}
}

//zhengshu
else
if(k==2)
{
for(int j=0;j<30;j++)
{
int x = (int)(Math.random()*100);
int y = (int)(Math.random()*100);
int z = (int)(Math.random()*100);
if(z%4==0)
System.out.println(x+"-"+y+"=");
else if(z%4==1)
System.out.println(x+"+"+y+"=");
else if(z%4==2)
System.out.println(x+"*"+y+"=");
else if(z%4==3)
//判断除数为0的情况
if(y==0)
{
int p=0;
while(p==0)
{
y = (int)(Math.random()*100);
if(y!=0)
p=1;
}
System.out.println(x+"/"+y+"=");
}
else if(y!=0)
System.out.println(x+"/"+y+"=");

}
}

}

}

截图：

课上原因分析：

由于寒假过于放松导致不熟练。