Question

How to make a program in c++ that has these 2 options in a menu :1. Add a coefficient and degree of variable x to a polynomial 2. Give a value to the variable x in the polynomial and receive the result. While using the program, if the user decides to choose option 1 again, the value entered will be added to the existing polynomial.

Answer 1

Solution:

#include <iostream>
#include<cmath>
using namespace std;

int main()
{
int ch=0,i=0,j,v,result=0;
int length{};
length=2;
int *array{ new int[length]{} }; //dynamic array that used to store coefficient and degrees.
  
while(ch!=2){
cout<<"1.Add a coefficient and degree of variable x to a polynomial"<<endl;
cout<<"2.Give a value to variable x and get the result."<<endl;
cin>>ch;
if(ch==1){
cout<<"Enter coefficient:"<<endl;//if ch is 1,read inouts from user and add them to array
cin>>array[i];
cout<<"Enter degree:"<<endl;
cin>>array[i+1];
i=i+2;
length=length+2;
}
else if(ch==2){//if ch is 2,read valur for x and compute polynomial value
cout<<"Enter value to variable x";
cin>>v;
for(j=0;j<=i-2;j+=2){
result+=(array[j]*pow(v,array[j+1]));//use the coefficient and degree values from array and compute result
}
cout<<"The result is :"<<result<<endl;
}
}
return 0;
}

Screenshots:
The screenshots are attached below for reference along with output.
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