C#不接受c1,c2,c3作为定义的变量

Question

if(API>30)
{
   double c1 = 0.0178; 
   double c2 = 1.187; 
   double c3 = 23.931;
}
else
{
   double c1 = 0.0362; 
   double c2 = 1.0937;
   double c3 = 25.7240;
}

double Rs2 = (c1 * sg * Math.Pow(p, c2)) * Math.Exp(c3 * (API / T));

C#不接受c1,c2,c3在我的代码定义瓦尔,我怎么能解决这个问题？

Answer 1

每个变量都有它的定义范围.当块中定义的c中的变量(意思是a {和a 之间})限于该范围时,意味着它只能在该范围内引用.因此,在最后一行你出的定义范围c1,c2,c3而不能指代他们.

您需要在块外定义它们:

double c1, c2, c3;
if(API>30)
{
   c1 = 0.0178; c2 = 1.187; c3 = 23.931;
}
else
{
   c1 = 0.0362; c2 = 1.0937; c3 = 25.7240;
}

double Rs2 = (c1 * sg * Math.Pow(p, c2)) * Math.Exp(c3 * (API / T));