为什么这个程序告诉我传递了无效参数？

Question

老实说，我什至不知道我现在想做什么。但是在我让这个函数工作之前我不能更进一步，而且它每次都抛出异常，出了什么问题？例外是 "Unhandled exception at 0x0F61CAB6 (ucrtbased.dll) in CS 330 19S, P1, Calvert, Program 1.exe: An invalid parameter was passed to a function that considers invalid parameters fatal"

#include<iostream>
#include<vector>
#include <fstream>
using namespace std;

struct Kinematic {
    vector<vector<float>> position;
    float orientation;
    vector<vector<float>> velocity;
    float rotation;
};

struct StreeringOutput {
    vector<vector<float>> linear;
    float angular;
};

void update(StreeringOutput steering, float time, Kinematic k) 
{
    for (int i = 0; i < 100; i++) 
    {
        for (int j = 0; j < 100; j++) 
        {
            k.position[i][j] += k.velocity[i][j] * time + 
                           0.5*steering.linear[i][j] * time*time;
                           //the above command is where it throws the exception
            k.velocity[i][j] += steering.linear[i][j] * time;
        }
    }
    k.orientation += k.rotation*time + 0.5*steering.angular*time*time;
    k.rotation = steering.angular*time;

}


int main()
{
    int test;
    Kinematic kin;
    StreeringOutput steering;
    float time = 0.0;

    ofstream outfile;
    outfile.open("Output.txt");

    for (int i = 0; i < 100; i++)
    {
        update(steering, time, kin);
        time += 0.5;
    }
    cin >> test;
    return 0;
}

Answer 1

程序启动时，您创建对象：

Kinematic kin;
StreeringOutput steering;

这称为默认初始化，即所有成员都初始化为默认值。 vector为空状态

但是 update 会做这些事情：

// i and j can be as large as 99
k.position[i][j]
k.velocity[i][j]
steering.linear[i][j]

但是position等都是空的！ vectors 无法自动增长以满足您的需求。您正在索引越界，这是未定义的行为。

您应该正确初始化向量以确保实际上有 100 个元素：

Kinematic kin;
kin.position.assign(100, vector<float>(100));
// same for others

为什么这个程序告诉我传递了无效参数？

Why is this program telling me invalid parameter was passed?

c++

parameter-passing

2d-vector