d3zb.cpp

利用方程求解方法编写

// 计算方程ax^2+bx+c=0的解
#include<iostream.h>
#include<math.h>
void main()
{ 
	float a,b,c;
	float x1,x2,delta,del;
	cout<<"输入三个系数a(a!=0),b,c:"<<endl;
	cin>>a>>b>>c;
	cout<<"a="<<a<<"\n"<<"b="<<b<<"\n"<<"c="<<c<<endl;
	delta=b*b-4*a*c;
	if(delta<0)
	{
		cout<<"方程无解"<<endl;
	}
	    else if(delta=0)
		{
			cout<<"方程有两个相同的解"<<"\n"<<endl;
		    cout<<"x1=x2="<<-b/(2*a)<<endl;
		}	    
	     	else 
			{
				  del=sqrt(delta);
	              x1=(-b-del)/(2*a);
		          x2=(-b+del)/(2*a);
				  cout<<"方程的解是："<<"\n"<<"x1="<<x1<<"\t"<<"x2="<<x2<<endl;
			}
}