Question

#include <iostream>

using namespace std;
struct node
{
int base=0;
int power=0;
};

void insert(node ptr[],int basee,int powerr)
{
ptr[powerr].power=powerr;
ptr[powerr].base=basee;

}

void subtract(node ptr1[],int size1,node ptr2[],int size2,node ptr3[])
{
for(int j=0;j<=size1;j++)
{ if(ptr1[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)+(ptr1[j].base);
ptr3[j].power=ptr2[j].power;
}

}
for(int j=0;j<=size2;j++)
{
if(ptr2[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)-(ptr2[j].base);
ptr3[j].power=ptr2[j].power;
}

}

}

void addition(node ptr1[],int size1,node ptr2[],int size2,node ptr3[])
{
for(int j=0;j<=size1;j++)
{ if(ptr1[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)+(ptr1[j].base);
ptr3[j].power=ptr2[j].power;
}

}
for(int j=0;j<=size2;j++)
{
if(ptr2[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)+(ptr2[j].base);
ptr3[j].power=ptr2[j].power;
}

}

}

void display(node ptr[],int size)
{
if(ptr[0].base!=0){
cout<<ptr[0].base<<"+";}
for(int i=1; i<=size; i++)
{
if(ptr[i].base!=0){
cout<<ptr[i].base<<"x^"<<ptr[i].power<<"+";}
}
}
void multiply(node ptr1[],int size1,node ptr2[],int size2,node ptr3[])
{
  
}

int main()
{
bool choice1=true;
bool choice2=true;
int size1,size2,base1,base2,power1,power2;
cout<<"enter the max power in polynominal 1: ";
cin>>size1;
node *a= new node[size1+1];
while(choice1==true)
{
cout<<" enter the base,the power of x: ";
cin>>base1>>power1;
insert(a,base1,power1);
cout<<endl<<"1:write another value in this equation, 0:end"<<endl;
cin>>choice1;
}
display(a,size1);

cout<<"enter the max power in polynominal 2: ";
cin>>size2;
node *b= new node[(size2+1)];

while(choice2==true)
{
cout<<" enter the base,the power of x: ";
cin>>base2>>power2;
insert(b,base2,power2);
cout<<endl<<"1:write another value in this equation, 0:end"<<endl;
cin>>choice2;
}
display(b,size2); cout<<endl;

/*node *add=new node[(size1+size2+1)];

addition(a,size1,b,size2,add);
display(add,(size1+size2+1)); */

/* node *sub=new node[(size1+size2+1)];

subtract(a,size1,b,size2,sub);
display(sub,(size1+size2+1));
*/

}

I need a multiply function for this single variable polynomial arthimethic operations program

Answer 1

//The program works fine now...
//I have made a few changes
//I included a function make zeroes instead of assigning values directly inside the struct definition so that works better
//Then there was a small error in the code for multiplication.. Then I corrected it too..
#include <iostream>
using namespace std;
struct node
{
int base;
int power;
};
void make_zeros(node ptr[],int size1)
{
for(int i=0;i<=size1;++i)
{
ptr[i].base=0;
ptr[i].power=0;
}
}
void insert(node ptr[],int basee,int powerr)
{
ptr[powerr].power=powerr;
ptr[powerr].base=basee;
}

void subtract(node ptr1[],int size1,node ptr2[],int size2,node ptr3[])
{
for(int j=0;j<=size1;j++)
{
if(ptr1[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)+(ptr1[j].base);
ptr3[j].power=ptr2[j].power;
}

}
for(int j=0;j<=size2;j++)
{
if(ptr2[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)-(ptr2[j].base);
ptr3[j].power=ptr2[j].power;
}

}
}
void addition(node ptr1[],int size1,node ptr2[],int size2,node ptr3[])
{
for(int j=0;j<=size1;j++)
{
if(ptr1[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)+(ptr1[j].base);
ptr3[j].power=ptr2[j].power;
}

}
for(int j=0;j<=size2;j++)
{
if(ptr2[j].base!=0)
{
ptr3[j].base=(ptr3[j].base)+(ptr2[j].base);
ptr3[j].power=ptr2[j].power;
}

}
}

void display(node ptr[],int size)
{
if(ptr[0].base!=0)
{
cout<<ptr[0].base<<"+";
}
for(int i=1; i<=size; i++)
{
if(ptr[i].base!=0)
{
cout<<ptr[i].base<<"x^"<<ptr[i].power<<"+";
}
}
}
void multiply(node ptr1[],int size1,node ptr2[],int size2,node ptr3[])
{
for(int i=0;i<=size1;i++)
{
for(int j=0;j<=size2;j++)
{
ptr3[ptr1[i].power+ptr2[j].power].base=ptr3[ptr1[i].power+ptr2[j].power].base+(ptr1[i].base*ptr2[j].base);
ptr3[ptr1[i].power+ptr2[j].power].power=ptr1[i].power+ptr2[j].power;
}
}
}
int main()
{
bool choice1=true;
bool choice2=true;
int size1,size2,base1,base2,power1,power2;
cout<<"Enter the max power in polynominal 1: ";
cin>>size1;
node *a= new node[size1+1];
make_zeros(a,size1+1);
while(choice1==true)
{
cout<<"Enter the base,the power of x: ";
cin>>base1>>power1;
insert(a,base1,power1);
cout<<endl<<"1:Write another value in this equation, 0:end"<<endl;
cin>>choice1;
}
display(a,size1);
cout<<"\nEnter the max power in polynominal 2: ";
cin>>size2;
node *b= new node[(size2+1)];
make_zeros(b,size2+1);
while(choice2==true)
{
cout<<"Enter the base,the power of x: ";
cin>>base2>>power2;
insert(b,base2,power2);
cout<<endl<<"1:Write another value in this equation, 0:end"<<endl;
cin>>choice2;
}
display(b,size2);
cout<<endl;

/*node *add=new node[(size1+size2+1)];

addition(a,size1,b,size2,add);
display(add,(size1+size2+1)); */

/* node *sub=new node[(size1+size2+1)];

subtract(a,size1,b,size2,sub);
display(sub,(size1+size2+1));
*/
node *mul=new node[(size1+size2+1)];
make_zeros(mul,size1+size2+1);
multiply(a,size1,b,size2,mul);
display(mul,(size1+size2+1));
}

If there is any code then refer to the images given for the proper indentation of the code

Hope this helps
In case of any queries feel free to ask me in the comments section below
Happy Coding :) :)
Have a good day