error CS0161: not all code paths return a value,

I have a problem with small code: error CS0161: not all code paths return a value. I'm a beginner in coding and please help me.

Code (CSharp):

1.      public static float axisH = 0.0f;
2.      public static float axisV = 0.0f;
3.    
4.      void start(){
5.    
6.      float f =  InputGetAxis ("Horizontal") ;
7.      /...
8.    
9.      }
10.    
11.    
12.      float InputGetAxis (string axis){
13.    
14.    
15.              float v = Input.GetAxis(axis);
16.    
17.              if ((Mathf.Abs(v)) > 0.005f) return v ;
18.              else if     (axis =="Horizontal" ) return axisH ;
19.              else if (axis == "Vertical" ) return axisV ;
20.          }

 

you are missing an else

 

The code is comparing that you don't always return a value. One way to get around this is just to put a return 0 at the bottom of the code.

Edit: Think through what would happen if v was 1 and axis was "cat"