A Good Doubt Regarding Assignment Statement

Key Points on Variable Assignment in C++(taken from code snippet of Binary to Octal Conversion)

1. Variable Declaration and Initialization:

   • Declaring a variable (e.g., int ans = 0;) allocates a specific memory location for that variable and initializes it with a value (in this case, 0).

2. Understanding Assignment:

   • An assignment statement (ans = digit * pow(2, i) + ans;) consists of three parts: the left side (where the value is being stored), the right side (the expression being evaluated), and the = operator (which indicates assignment).

3. Same Memory Location:

   • Both instances of ans in the assignment refer to the same memory location because they represent the same variable.

4. Evaluation vs. Assignment:

   • When the right side is evaluated, the current value of ans at that memory address is used (which is 0 in the first iteration).
   • After evaluating the expression on the right, the left side updates the value at the same memory location with the result of that expression.

5. Update Process:

   • The process is sequential:
     1. Evaluate the right side using the current value.
     2. Assign the evaluated result to the variable on the left side.

6. Importance of Order:

   • It's crucial to recognize that the evaluation of the right side occurs completely before the assignment takes place. The left side cannot affect the value being computed on the right during that initial evaluation.

7. Impact on Subsequent Iterations:

   • After the first iteration, if digit is non-zero, the value of ans will no longer be 0. Each iteration builds upon the last by updating ans with the newly computed results.

These key points should help solidify your understanding of how variables and memory work in your code, particularly regarding the evaluation and assignment process.