Problems with debug and if-statement

I've got a set of one known issue here:

1. An if-statement expects a type to be boolean when it is an int. The peice of code works by itself, but not in combination with the entire code.

     //Element
        int element;
   
        void Start() {
        if      (element = 1) { Debug.Log("Type: Mundane"); }
        else if (element = 2) { Debug.Log("Type: Corrosive"); }
        else if (element = 3) { Debug.Log("Type: Explosive"); }
        else if (element = 4) { Debug.Log("Type: Electric"); }
        else                  { Debug.Log("Type: Cryogenic"); }
        }
   
   

Entire code:

 using UnityEngine;
 using System.Collections;
 
 public class BalancedWeaponRandomization : MonoBehaviour
 {
 
     //Element
     int element;
 
     //Damage
     float vDmg = 120;           //base stat value
     float rDmg = 0.175F;        //range (+/-)
     float dDmg = 0.175F;        //max balance delta
         public float resDmg;    //result from calculations
 
     //Fire Rate
     float vFrt = 400;
     float rFrt = 0.175F;
     float dFrt = 0.175F;
         public float resFrt;
 
     //Range
     float vRng = 800;
     float rRng = 0.125F;
     float dRng = 0.125F;
         public float resRng;
 
     //Resource cost
     float vVal = 5000;
         public float resVal;
 
 
     void Update()
     {
         if (Input.GetKeyDown(KeyCode.KeypadEnter))
         {
             Debug.ClearDeveloperConsole();
             GenerateWeapon();
         }
     }
 
 
     void GenerateWeapon()
     {
 
         //Element
         float k = Random.value;
         if      (k <= 4 / 16)    { element = 1; }
         else if (k <= 7 / 16)    { element = 2; }
         else if (k <= 10 / 16)   { element = 3; }
         else if (k <= 13 / 16)   { element = 4; }
         else                     { element = 5; }
 
 
         //Pre calculation
         float ranPre = (Random.value - 0.5F) * 2 + 1;
 
 
         //Damage
         float balDmg = -Random.value * ((ranPre - 1) / 1) * dDmg;
         float ranDmg = (Random.value - 0.5F) * 2 * rDmg + 1;
 
             resDmg = Mathf.Ceil((ranDmg + balDmg) * vDmg / 2) * 2;
 
 
         //Fire Rate
         float balFrt = -Random.value * ((ranDmg - 1 - balDmg) / rDmg) * dFrt;
         float ranFrt = (Random.value - 0.5F) * 2 * rFrt + 1;
 
             resFrt = Mathf.Ceil((ranFrt + balFrt) * vFrt / 10) * 10;
 
 
         //Range
         float balRng = -Random.value * ((ranFrt - 1 - balFrt) / rFrt) * dRng;
         float ranRng = (Random.value - 0.5F) * 2 * rRng + 1;
 
             resRng = Mathf.Ceil((ranRng + balRng) * vRng / 10) * 10;
 
 
         //Resource cost
         resVal = Mathf.Ceil(((resDmg / vDmg - 1) + (resFrt / vFrt - 1) + (resRng / vRng - 1) + 1) * vVal / 10) * 10;
 
 
 
         //Feedback stuff
         if      ((resDmg / vDmg - 1) + (resFrt / vFrt - 1) + (resRng / vRng - 1) <= -(vDmg + vFrt + vRng))        { Debug.Log("Quality: Unparalleled"); }
         else if ((resDmg / vDmg - 1) + (resFrt / vFrt - 1) + (resRng / vRng - 1) <= -(vDmg + vFrt + vRng) * 0.6)  { Debug.Log("Quality: Atrocious"); }
         else if ((resDmg / vDmg - 1) + (resFrt / vFrt - 1) + (resRng / vRng - 1) <= -(vDmg + vFrt + vRng) * 0.2)  { Debug.Log("Quality: Inferior"); }
         else if ((resDmg / vDmg - 1) + (resFrt / vFrt - 1) + (resRng / vRng - 1) <=  (vDmg + vFrt + vRng) * 0.2)  { Debug.Log("Quality: Adequate"); }
         else if ((resDmg / vDmg - 1) + (resFrt / vFrt - 1) + (resRng / vRng - 1) <=  (vDmg + vFrt + vRng) * 0.6)  { Debug.Log("Quality: Superior"); }
         else if ((resDmg / vDmg - 1) + (resFrt / vFrt - 1) + (resRng / vRng - 1) <=  (vDmg + vFrt + vRng))          { Debug.Log("Quality: Exquisite"); }
         else                                                                                                      { Debug.Log("Quality: Unparalleled"); }
 
         //Here it expects the int 'element' to be a boolean for some reason.
         if        (element = 1) { Debug.Log("Type: Mundane"); }
         else if (element = 2) { Debug.Log("Type: Corrosive"); }
         else if (element = 3) { Debug.Log("Type: Explosive"); }
         else if (element = 4) { Debug.Log("Type: Electric"); }
         else                  { Debug.Log("Type: Cryogenic"); }
 
         Debug.Log("Damage: " + resDmg);
         Debug.Log("Rate: " + resFrt);
         Debug.Log("Range: " + resRng);
         Debug.Log("Value: " + resVal);
 
 
     }
 
 
 }