Sum up arrays isn't summing correctly - C language

Question

I had homework assigned to save either 0 or 1 in two arrays, calculate the sum as they were binary numbers and return the result, just like you would do by hand, but the sum of is wrong, here is a little example of inputs and outputs:

//Input example -> num1[] = {0,1}; num2[] = {0,1}
//Result I want to get = 1,0
//Result I get = 0, 0

Here´s the code of the sum part

#include <stdio.h>

int main(void) {

  int leave = 0, input;
  int num1[9], num2[8], result[12], carry = 0, i, i2;

   //Getting inputs
   for (i = 0; i < 9; i++) {
     printf("Type 0 or 1 to save in position %d of num1\n", i + 1);
     scanf("%d", &num1[i]);

     //Condition to exit the loop
     if (num1[i] > 1 || num1[i] < 0) {
       num1[i] = 0;
       printf("Exiting loop...\n");
       break;
     }
   }

    for (i = 0; i < 9; i++) {
      printf("Type 0 or 1 to save in position %d of num2\n", i + 1);
      scanf("%d", &num2[i]);

     //Condition to exit the loop
      if (num2[i] > 1 || num2[i] < 0) {
        num2[i] = 0;
        printf("Exiting loop...\n");
        break;
      }
    }

    //Sum of arrays
    for (i2 = 0; i2 < i; i2++) {
      if (num1[i2] == 1 && num2[i2] == 1) {
        if (carry== 1) {
          result[i2] = 1;
        } else {
          result[i2] = 0;
          carry = 1;
        }
      } else {
        result[i2] = carry + num1[i2] + num2[i2];
        carry = 0;
      }
    }
  
    //Showing results
    for (i2 = 0; i2 <= i; i2++) {
      printf("%d", result[i2]);
    }
    return 0;
   }

Answer 1

1. Boundary exceed C doesn't check for bounds or boundary and not even gives you a ⚠ warning.
you have declared num2[8] that has reserved memory for 8 integer elements
but you are explicitly giving it 9 elements to store through

for (i = 0; i < 9; i++) {
      printf("Type 0 or 1 to save in position %d of num2\n", i + 1);
      scanf("%d", &num2[i]);

that results to overwrite an other memory address' value that can cause disfunction to your program.(In my case num1[0] was overwritten)
So declare enough elements to work with arrays.
2. In this fragment

else {
        result[i2] = carry + num1[i2] + num2[i2];
        carry = 0;

if you encounter carry as 1 and (num1 or num2) as 1 this would lead you to wrong calculation.
So add some more instructions to counter it.
3.
Remove = from <=

//Showing results
    for (i2 = 0; i2 <= i; i2++) {
      printf("%d", result[i2]);
    }

to get result without printing a garbage value at the end. because result[9] has not assigned a value explicitly.