How does proper indentation improve the readability of a program in C++?

Proper indentation improves the readability of a C++ program by:

1. Visual Structure: It visually separates code blocks, making it easier to identify the beginning and end of loops, conditionals, and functions.

2. Hierarchy Clarity: Indentation indicates the hierarchy and flow of control, helping programmers understand the relationship between different parts of the code.

3. Error Reduction: Well-indented code can help in spotting errors or mismatched braces more easily.

4. Collaboration: Consistent indentation makes it easier for multiple programmers to read and understand each other's code.

Here’s an example of properly indented C++ code:

#include<iostream>
using namespace std;

int main() {
    for(int i = 0; i < 5; i++) {
        if(i % 2 == 0) {
            cout << i << " is even.\n";
        } else {
            cout << i << " is odd.\n";
        }
    }
    return 0;
}

In this example, the indentation clearly shows the structure of the loop and the conditional statements.