Question

c++ on MS VS it gives an error that on line 33 uninitialized local variable used( or see comment in code). On other compilers, code runs fine.

=====================================

#include <iostream>

using namespace std;

// Node structure w/ power and coefficient
struct Node
{
   int coeff;
   int pow;
   struct Node *next;
};

void create(int x, int y, struct Node** temp) {

   //declare structs
   struct Node *a, *b;

   //temp
   b = *temp;
   //if b null
   if (b == NULL) {
       a = new Node;
       a->coeff = x;
       a->pow = y;
       *temp = a;
       a->next = new Node;
       a = a->next;
       a->next = NULL;
   }

   //same as above, but do not allalocate new space first
   else {
       a->coeff = x;//<-------------------------this line that give error.
       a->pow = y;
       a->next = new Node;
       a = a->next;
       a->next = NULL;
   }
}

  

      

       int main()
       {
          

           return 0;

       }

Answer 1

#include <iostream>

using namespace std;

// Node structure w/ power and coefficient
struct Node {
    int coeff;
    int pow;
    struct Node *next;
};

void create(int x, int y, struct Node **temp) {

    //declare structs
    struct Node *a, *b;

    //temp
    b = *temp;
    //if b null
    if (b == NULL) {
        a = new Node;
        a->coeff = x;
        a->pow = y;
        *temp = a;
        a->next = new Node;
        a = a->next;
        a->next = NULL;
    }
        //same as above, but do not allalocate new space first
    else {
        a = new Node;   // we need to create a new node before assigning it values..
        a->coeff = x;//<-------------------------this line that give error.
        a->pow = y;
        a->next = new Node;
        a = a->next;
        a->next = NULL;
    }
}


int main() {
    return 0;
}