Why do I need to have 1value as the left operand of an assignment

[cplusone]

Write your question here.

  #include <iostream>

using namespace std;

int main()
{
    int  a;
    int  b;
    int  c;
    int  d;
    int  e;
    int  f;
    int  g;
    int  h;
    int  i;
    int  j;


    cout << "Enter your x^2 coefficient. If there is no coefficient beside it enter 1." << "\n" << "This means the a in standard form ax^2+bx+c:";
    cin >> a;
    cout << "Now enter your second x coefficient:";
    cin >> b;
    cout << "\n" "Finally, enter your c value:" << "\n";
    cin >> c;
    cout << "Now i will solve." << "\n";

    if(a>1 || a<1)
    {
    b/a = d;
    c/a = e;
    d/2 = f;
    f*f = g;
    c-g = h;

     cout << "Your solution is:" << "(" << "x+" << f << ")" << "^2 +" << h;

    }
    else
    {
        b/2 = i;
        i*i = j;
        c-j = k;
        cout << "Your solution is;" << "(" << "x+" << i << ")" << "^2 +" << k;
    }
    system("PAUSE");
    return 0;
}

Compiling: main.cpp
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp: In function 'int main()':
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:29: error: lvalue required as left operand of assignment
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:30: error: lvalue required as left operand of assignment
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:31: error: lvalue required as left operand of assignment
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:32: error: lvalue required as left operand of assignment
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:33: error: lvalue required as left operand of assignment
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:40: error: lvalue required as left operand of assignment
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:41: error: lvalue required as left operand of assignment
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:42: error: 'k' was not declared in this scope
C:\CPP_Programs\Minigame\Converting from Standard To Vertex Form\main.cpp:45: error: 'system' was not declared in this scope
Process terminated with status 1 (0 minutes, 1 seconds)
9 errors, 0 warnings

Hello guys! Here is my code and warmings I am getting. I am an aspiring (beginner) programmer who am just trying to have some fun by having a program for quadratic conversion. Ill give you an example of how it works:
Lets say I have 2x^2 + 4x + 8
I would divide x^2 by 2 = x^2
I would divide 4 by 2 (b in my program): 4/2= 2
Then I would divide 8 by 2 (resulting variable e in my program) 8/2 = 4
Then I would square the result of dividing 4/2 = 2. So 2^2=4
Then I would plug in the result of 4/2 = 2 into (x+(2))^2
Then subtract the 4 from 8, 8-4 = 4
Final answer: (x+2)^2 + 4.
This is the result I would want from my program.

How could I adjust my program to get it to get something like this result?
Why do i need to have 1value as the left operand of an assignment if the user will input numbers for the variables?

Thank you (all) so much in advance! I really appreciate your help!

[long double main]

You have your assignment backwards.
To assign a value to a variable, use variable_to_assign_to = value_to_assign_it;, not the other way around.

So it should be

d = b/a;
e = c/a;
f = d/2;
g = f*f;
h = c-g;

and so on.

Aside from that, you'll probably get incorrect solutions, because all of your variables are int variables and not all quadratic functions have their vertex at a point having integer x and y coordinates.

[cplusone]

Thank you, sir! I didn't realize this. And yes I know that integers aren't the only thing quadratics have. What thinking about assigning it as a long double

[long double main]

Generally speaking, double should typically suit your needs just fine.
I think in this case, long double is a bit overkill.

[cplusone]

Alright, will do! Thanks again.