给定二维数组a:
let a = [
[0, 0, 1, 0],
[0, 1, 1, 1],
[0, 0, 1, 0],
[0, 0, 1, 1]
]
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如何按给定因子进行缩放?例如,数组b是由4缩放的数组:
let b =[
[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, …Run Code Online (Sandbox Code Playgroud) 所以,我是C++的初学者......我认为我已经牢牢掌握了动态内存分配,但我想我没有.我在网上搜索了很多解决方案,但我仍然无法解决我的问题.我一直收到错误0xC00000FD:运行调试时堆栈溢出.我很确定这个问题与我在默认构造函数中分配内存的方式有关,但也许是其他的东西.我想我需要更深入的见解.任何帮助或暗示确定问题将不胜感激.
这是一个从用户输入计算矩形的面积和周长的简单程序.
这是头文件:
#pragma once
class my_Rectangle
{
private:
float m_area;
float m_perimeter;
float m_length;
float m_width;
void update_rec();
my_Rectangle*tempSTORE;
public:
float calc_area(float length,float width);
float calc_perim(float length,float width);
void change_RECTsize(float length,float width,my_Rectangle tempSTORE);
my_Rectangle(); //constructor
my_Rectangle(float length,float width);
~my_Rectangle(); //destructor
};
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这是类成员定义文件:
#include "StdAfx.h"
#include "my_Rectangle.h"
#include <iostream>
//using namespace std;
//This function calculates the area
float my_Rectangle::calc_area(float length,float width)
{
float area = width * length;
std::cout<<"\nThe area of the rectangle is: "<<area<<" square metres."<<std::endl; // ::scope operater …Run Code Online (Sandbox Code Playgroud) let locArr = [{ x: 0, y: 0 }, { x: 2, y: 4 }, { x: 6, y: 8 }];
// my asynchronous function that returns a promise
function findLoc(x, y) {
return new Promise((resolve, reject) => {
let a = setTimeout(() => {
resolve({ x: x * x, y: y * y });
}, 500);
});
}
Promise.all([
// my problem is below
findLoc(locArr[0].x, locArr[0].y),
findLoc(locArr[1].x, locArr[1].y),
findLoc(locArr[2].x, locArr[2].y),
]).then(values => {
// all values from all the …Run Code Online (Sandbox Code Playgroud) javascript ×2
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