How to prototype app design?

Question

C++ / C#

I understand that the question is quite general, but:
- What is worth reading on this topic?
- In what programs do you usually sketch application design prototypes? (is it just photoshop, or something more specific?)

Answer 1

You have some confusion in the structure of the code.
The FixedUpdate and Jump functions are outside the class, the last curly brace is generally superfluous.

Answer 2

something like this

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Управление : MonoBehaviour
{
    Rigidbody2D rb;
    Animator anim;
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        anim = GetComponent<Animator>();

    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {



        }
        if (Input.GetAxis("Horizontal") == 0)
        {
            anim.SetInteger("stay", 1);
        }
        else
        {
            Flip();
            anim.SetInteger("stay", 2);
        }
    }
    void Flip()
    {
        if (Input.GetAxis("Horizontal") < 0)
            transform.localRotation = Quaternion.Euler(0, 0, 0);
        if (Input.GetAxis("Horizontal") > 0)
            transform.localRotation = Quaternion.Euler(0, 180, 0);
    }
    void FixedUpdate()
    {
        rb.velocity = new Vector2(Input.GetAxis("Horizontal") * 12f, rb.velocity.y);
    }
    void jump()
    {
        rb.AddForce(transform.up * 14f, ForceMode2D.Impulse);
    }
}

Answer 3

There are special programs, for example free pencil.evolus.vn or paid https://balsamiq.com/products/mockups/