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我就是吴小鸡

为什么代码这么乱？

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我就是吴小鸡

从发一次

#include <bits/stdc++.h>
using namespace std;

int main()
{
	int xz,a[15],i,j,t,n,sx,mx,xs,gc,slh,n1,n2,ts,js,sw1,sw2,jsh,c,sw1_zs,sw2_zs,high,bottom1,bottom2,r;
	const float PI = 3.14;
	cout<<"请输入计算公式（1排序，2等差数列，3计算器，4鸡兔同笼，5几何问题）：";cin>> xz;
	
	
	//排序 
	if (xz == 1)   //此方法是冒泡排序，用到了数组。 
	{
		cout<<"请输入要排序数字的个数(最多15个)：";cin>>n;
		for(i=1;i<=n;i++)
		{
			cout<<"第"<<i<<"个数：";
			cin>>a[i];
		}
		for(i=1;i<=n-1;i++)
		{
			for(j=1;j<=n-i;j++)
			{
				if(a[j] > a[j+1])
				{
					t = a[j];
					a[j]=a[j+1];
					a[j+1] = t; 
				} 
			}
		}
		cout<<"排好后的顺序是：";
		for(i=1;i<=n;i++)
		    cout<<a[i]<<"  ";
	}
	
	//等差数列 
	else if(xz == 2)
	{
		cout<<"请输入要计算的（1首项，2末项，3项数，4数列和）：";cin>> xz;
		if (xz == 1)
		{
			cout<<"请输入末项：";
			cin>>mx;
			cout<<"请输入项数：";
			cin>>xs;
			cout<<"请输入公差：";
			cin>>gc;
			sx=mx-(xs-1)*gc;
			cout<<"首项是："<<sx; 
		}else if(xz == 2)
		{
			cout<<"请输入首项：";
			cin>>sx;
			cout<<"请输入项数：";
			cin>>xs;
			cout<<"请输入公差：";
			cin>>gc;
			mx=sx+(xs-1)*gc;
			cout<<"末项是："<<mx;
		}else if(xz == 3)
		{
			cout<<"请输入末项：";
			cin>>mx;
			cout<<"请输入首项：";
			cin>>sx;
			cout<<"请输入公差：";
			cin>>gc;
			xs=(mx-sx)/gc+1;
			cout<<"项数是："<<xs;		
		}else{
			cout<<"请输入首项：";
			cin>>sx;
			cout<<"请输入末项：";
			cin>>mx;
			cout<<"请输入项数：";
			cin>>xs;
			slh=(sx+mx)*xs/2;
			cout<<"数列和是："<<slh;		
	    }
	}
	
	//计算器 
	else if(xz == 3)
	{
		cout<<"请输入运算方法（1加法，2减法，3乘法，4除法）：";cin>> xz;
		cout<<"请输入第一个数字：";cin>>n1;
		cout<<"请输入第二个数字：";cin>>n2;
		if(xz == 1)
			cout<<n1+n2;
		else if(xz == 2)
			cout<<n1-n2;
		else if(xz == 3)
		  	cout<<n1*n2;
		else
			cout<<n1/n2;
	}
	
	//鸡兔同笼 
	else if(xz == 4)
	{
		cout<<"请输入一共有几条腿：";cin>>js;
		cout<<"请输入一共有多少个头（一共的只数）：";cin>>ts;
		cout<<"请输入生物1一只的腿数：";cin>>sw1;
		cout<<"请输入生物2一只的腿数：";cin>>sw2;
		if (sw1 > sw2)
		{
			jsh = sw2*ts;
			c = js - jsh;
			sw1_zs = c/(sw1 - sw2);
			sw2_zs = ts - sw1_zs;
		}
		else
		{
		    jsh = sw1*ts;
			c = js - jsh;
			sw2_zs = c/(sw2 - sw1);
			sw1_zs = ts - sw2_zs;
		}
		cout<<"生物一喵<<sw1_zs<<"只"<<endl;
		cout<<"生物二喵<<sw2_zs<<"只"<<endl;
	}
	
	//几何问题
	else if(xz == 5)
	{
		cout<<"请输入你要计算的图形（1平行四边形和长方形，2三角形，3梯形，4圆）";cin>>xz;
		if (xz == 1)
		{
			cout<<"请输入高（长）：";cin>>high;
			cout<<"请输入底（宽）：";cin>>bottom1;
			cout<<"面积是"<<high*bottom1<<endl;
			cout<<"周长是"<<(high+bottom1)*2;
		}
		else if(xz == 2)
		{
			cout<<"请输入高：";cin>>high;
			cout<<"请输入底：";cin>>bottom1;
			cout<<"面积是"<<high*bottom1/2<<endl;
		}
		else if(xz == 3)
		{
			cout<<"请输入高：";cin>>high;
			cout<<"请输入上底：";cin>>bottom1;
			cout<<"请输入下底：";cin>>bottom2;
			cout<<"面积是"<<(bottom1+bottom2)*high/2<<endl;
		}
		else
		{
			cout<<"请输入半径：";cin>>r;
			cout<<"面积是"<<PI*r*r<<endl;
			cout<<"周长是"<<2*PI*r<<endl;
		}
	} 
}

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