polynomial - Algorithms Source Code in C++

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Home » C++ Home » Algorithms Home » polynomial

A D V E R T I S E M E N T

Title	polynomial
Author	niravres
Author Email	neo_pathak [at] yahoo.com
Description	it evaluates the value of any polynomial of any degree,adds two poly and also multiplies them
Category	C++ » Algorithms
Hits	367634
Code	Select and Copy the Code
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(floata,int dega,floatb,int degb,floatsum) {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(floata,int dega,floatb,int degb,floatmult) {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(floata,int n,float x) {float val=0,prod=1 ; int i ; for(i=0;i<=n;i++) {val = val+a[i]prod; prod = prodx ;} return val ; } //******************************************************* double power(floata,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 ;}

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