C#加减乘除

C#加减乘除

#region 数值计算
		 
/// <summary>
/// 求2个数的百分比
/// </summary>
/// <param name="num1"></param>
/// <param name="num2"></param>
/// <returns></returns>
public string GetRate(string num1, string num2)
{
	if (string.IsNullOrEmpty(num1) || string.IsNullOrEmpty(num2))
		return string.Empty;

	string result = string.Empty;

	double number1 = Convert.ToInt64(num1);
	double number2 = Convert.ToInt64(num2);

	double number3 = (number1 / number2) * 100.00;
	result = string.Format("{0:F2}%", number3);

	return result;
}

/// <summary>
/// 两个数相加
/// </summary>
/// <param name="num1"></param>
/// <param name="num2"></param>
/// <returns></returns>
public string Add(string num1, string num2)
{
	if (string.IsNullOrEmpty(num1) || string.IsNullOrEmpty(num2))
		return string.Empty;

	string result = string.Empty;

	int number1 = Convert.ToInt32(num1);
	int number2 = Convert.ToInt32(num2);

	int number3 = number1 + number2;

	result = number3.ToString();

	return result;
}


/// <summary>
/// 两个数相减
/// </summary>
/// <param name="num1"></param>
/// <param name="num2"></param>
/// <returns></returns>
public string Subtraction(string num1, string num2)
{
	if (string.IsNullOrEmpty(num1) || string.IsNullOrEmpty(num2))
		return string.Empty;

	string result = string.Empty;

	int number1 = Convert.ToInt32(num1);
	int number2 = Convert.ToInt32(num2);

	int number3 = number1 - number2;

	result = number3.ToString();

	return result;
}


/// <summary>
/// 两个数相除
/// </summary>
/// <param name="num1"></param>
/// <param name="num2"></param>
/// <returns></returns>
public string Division(string num1, string num2)
{

	if (string.IsNullOrEmpty(num1) || string.IsNullOrEmpty(num2))
		return string.Empty;

	string result = "";

	try
	{
		int number1 = Convert.ToInt32(num1);
		int number2 = Convert.ToInt32(num2);
		double number3 = number1 * 1.00 / number2;
		result = number3.ToString("F2");
	}
	catch (Exception)
	{

	}

	return result;
}

#endregion