C#에서 '할당되지 않은 지역 변수 사용' 오류를 해결하는 방법은 무엇입니까?

<code class="language-csharp">if (creditPlan == "0")
{
    annualRate = 0.35;
    lateFee = 0.0;
    monthlyCharge = balance * (annualRate * (1.0 / 12.0)); // Note: Use 1.0/12.0 for floating-point division
}
else
{
    // Handle other credit plan scenarios here.  Assign values to annualRate, lateFee, and monthlyCharge.
    annualRate = 0.0; //Example: Default values
    lateFee = 0.0;
    monthlyCharge = 0.0;
}</code>

<code class="language-csharp">double annualRate = 0.0;
double lateFee = 0.0;
double monthlyCharge = 0.0;

if (creditPlan == "0")
{
    annualRate = 0.35;
    lateFee = 0.0;
    monthlyCharge = balance * (annualRate * (1.0 / 12.0));
}
// ... rest of your code ...</code>

<code class="language-csharp">switch (creditPlan)
{
    case "0":
        annualRate = 0.35;
        lateFee = 0.0;
        monthlyCharge = balance * (annualRate * (1.0 / 12.0));
        break;
    case "1":
        // Handle credit plan "1"
        annualRate = 0.25; //Example
        lateFee = 10.0; //Example
        monthlyCharge = balance * (annualRate * (1.0 / 12.0)); //Example
        break;
    default:
        // Handle default or unknown credit plans
        annualRate = 0.0;
        lateFee = 0.0;
        monthlyCharge = 0.0;
        break;
}</code>