Question

C#编程当a=1时b=0.5;当a=2时b=1当a=3时b=0.8当a=4时b=0.3

Answer 1

int a;float b;
float arr=new int[]{0.5, 1, 0.8 ,0.3};
if(a<5&&a>0)
{
b=arr[a-1];
}
//b就是想要的结果啦。

Answer 2

最简单明白的switch
//int a=xxxxx;

decimal b = 0;

switch (a)
{
case 1:
b = 0.5m;
break;
case 2:
b = 1m;
break;
case 3:
b = 0.8m;
break;
case 4:
b = 0.3m;
break;
default:
b = 0;
break;
}

如果想用数组匹配的话
落月Prc发的是在没意思,可读性太差.
楼下的字典比他的好

Answer 3

最简单的方法就是switch或字典了！
给个字典的例子给你哈！
Single GetValue(Single a){
var dict=new SortedDictionary<Single,Single>
{
{1f,0.5f},{2f,1f},{3f,0.8f},{4f,0.3f}
};
Single ret;
if(dict.TryGetValue(a,out ret))
return ret;
else
throw new ObjectNotFoundException();
}