That's because you call input() in the Update method, which is called each frame. Put your input() in the input taking if block.

void Update()
{  
 if (Input.GetKeyDown (KeyCode.Return))
 {
    input ();
    Debug.Log (finalResult);
 }   
}

Now input only gets called once you press down Return.

That is because you call input() in the Update method, which is called each frame. Put your input() in the input-taking if block.

void Update()
{  
     if (Input.GetKeyDown (KeyCode.Return))
     {
        input ();
        Debug.Log (finalResult);
     }   
}

Now input only gets called once you press down Return.

That's because you call input() in the Update method, wich is called each frame. Change your code to

void Update(){  
if (Input.GetKeyDown (KeyCode.Return))
    input ();
    Debug.Log (finalResult);
 
    }

Now input only gets called once you press Return.

That's because you call input() in the Update method, which is called each frame. Put your input() in the input taking if block.

void Update() 
{  
 if (Input.GetKeyDown (KeyCode.Return))
 {
    input ();
    Debug.Log (finalResult);
 }    
}

Now input only gets called once you press down Return.