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c++/Others/It evaluates the value of any polynomial of any degree, adds two poly.cpp

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+It evaluates the value of any polynomial of any degree, adds two poly
+and also multiplies them
+
+Code :
+
+/*evaluates, adds ,multiplies two polynomials p & f to evaluate poly of
+deg > 20 manipulate const in size */
+
+#include <iostream.h>
+using namespace std ;
+void polyadd(float*a,int dega,float*b,int degb,float*sum)
+{int i ;
+if(dega>=degb)
+{for (i=0;i<=dega;i++)
+sum[i]=a[i]+b[i] ;}
+if(degb >dega)
+{for(i=0;i<=degb;i++)
+sum[i]= a[i]+b[i] ; }
+}
+//********************************************
+/*void polymult(float*a,int dega,float*b,int degb,float*mult)
+{int i,j;
+if(dega<=degb)
+for(i=0;i<=degb;i++)
+{for(j=0;j<=i;j++)
+mult[i]= mult[i] + a[j]*b[i-j]  ;
+mult[i] = mult[i] +a[i+1]*b[i+1] ; }
+//mult[i] = mult[i] - a[0]*b[0] ; }
+if (degb<dega)
+{for(i=0;i<=dega;i++)
+for(j=0;j<=i;j++)
+ mult[i]= mult[i] +a[j]*b[i-j];
+mult[i] = mult[i] +a[i+1]*b[i+1] ;} }*/
+//********************************************************
+
+double power(float*a,int n,float x)
+{float val=0,prod=1 ;
+int i ;
+for(i=0;i<=n;i++)
+{val = val+a[i]*prod;
+prod = prod*x ;}
+return val ; }
+//********************************************************
+
+double power(float*a,int n,float x);
+
+main()
+{const int size=20 ;
+int deg,j  ;
+float a[size], x ;
+for(j=0;j<=size-1;j++)
+a[j] = 0.0 ;
+double ans ;
+cout<<"give the degree of the polynomiala "<<endl ;
+cin>>deg ;
+if(deg<0)
+cout<<"go learn ur textbook"<<endl ;
+if(deg>=0)
+{
+cout<<"give the value of the coefficients"<<endl ;
+for (j=0;j<=deg;j++)
+cin>>a[j] ;
+cout<<"give the value x"<<endl ;
+cin>>x ;
+ans  = power(a,deg,x);
+cout<<"the value of p("<<x<<") = "<<ans <<endl ;
+ }
+
+float b[size],sum[size],mult[size],y  ;
+for(j=0;j<=size-1;j++)
+b[j] = sum[j] = mult[j] = 0 ;
+int dega,degb ;
+dega = deg ;
+/*cout<<"give the value of the coefficients"<<endl ;
+for (j=0;j<=dega;j++)
+cin>>a[j]; */
+cout<<" give in the degree of poly b"<<endl ;
+cin>>degb ;
+cout<<"enter the values of the coefficient of polynomialb"<<endl ;
+for(j=0;j<=degb;j++)
+cin>>b[j]  ;
+cout<<"give the value to be substituted in polynomialb"<<endl ;
+cin>>y ;
+ans = power(b,degb,y) ;
+
+cout<<"the value of f("<<y<<") ="<<ans<< endl ;
+cout<<"the value of f("<<x<<") ="<<power(b,degb,x)<<endl ;
+string decision ;
+cout<<"to you want to add or multiply a and b(type a or m) "<<endl ;
+cin>>decision ;
+if(decision =="a")
+{ polyadd(a,dega,b,degb,sum);
+if (dega>=degb)
+{ans= power(sum,dega,x);
+cout<<"the answer after addition of p("<<x<<") +f("<<x<<") 
+="<<ans<<endl
+;}
+if(degb>dega)
+{ans = power(sum,degb,x) ;
+cout<<"the answer after addition of p("<<x<<") +f("<<x<<") 
+="<<ans<<endl
+; }}
+if (decision=="m")
+//{polymult(a,dega,b,degb,mult);
+//if (dega>=degb)
+{ans= power(a,dega,x)*power(b,degb,y) ;
+
+//cout<<"the answer of multiplication"<<ans<<endl ;}
+//if (degb>dega)
+//{ ans = power(mult,degb,x) ;
+cout<<"the answer after multiplication of p("<<x<<") *f("<<y<<")
+="<<ans<<endl ;}
+return 0 ;}
+
+
+