<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Use conditionals and a for loop to return the sum of all odd numbers up to a given number.
<|im_end|>
<|im_start|>assistant
def sum_odd_nums(n):
    total = 0
    for i in range(1, n+1):
        if i % 2 != 0:
            total += i
    return total<|im_end|>
