如何使此代码输出字符串中的实际文本而不是内存地址？

Question

#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;

void printpart1(int length, string *printpart1[18]) {
    int dummy;
    for (int i = 0; i < length; i++)
        cout << (printpart1 + i) << endl;

    cin >> dummy;

}

int main() {
    const int ARRAY_SIZE = 18;
    int dummy;
    string part1[ARRAY_SIZE] = { "An example of a career associated with computer studies is a Software Engineer. To become a",
        "Software Engineer, a minimum of a Bachelor’s Degree in Software Engineering is required which ",
        "could be obtained by first going into Engineering in post-secondary and choosing Software ",
        "Engineering as your major. Alternatively you could get a degree in Computer Sciences or another ",
        "closely related field. While a Bachelor’s Degree is enough to get some jobs, some employment ",
        "opportunities may require a Master’s Degree. Tuition for Engineering at the University of Western ",
        "Ontario for Canadian students is around $6000 and requires four years for a Bachelor’s degree. ",
        "This means with tuition alone it will cost around $24000 for the minimum qualifications. This price is  ",
        "much higher factoring in books, living, food etc. An employee in this field makes an average of ",
        "$80000 yearly and could get a variety of benefits depending on the company employing them. An  ",
        "average day for a software engineer varies by company but generally seems to begin with a few  ",
        "hours of good work, followed by a break to walk around and talk to coworkers about either personal  ",
        "things or work related affairs followed by more coding. Some days there are interviews with clients  ",
        "where a software engineer and the client communicate and discuss details of the project. The ",
        "majority of the average workday of a Software Engineer is spent programming. ",
        "https://study.com/articles/Become_a_Computer_Software_Engineer_Education_and_Career_Roadmap.html",
        "https://www.univcan.ca/universities/facts-and-stats/tuition-fees-by-university/ ",
        "https://www.coderhood.com/a-day-in-the-life-of-a-software-engineer/"
    };

    string *part1PTR = part1;

    printpart1(ARRAY_SIZE, &part1PTR);

}

打印必须在以数组指针为参数的函数中完成。多年来，我一直在试图弄清楚如何使这项工作发挥作用。任何帮助将不胜感激。

Answer 1

你忘了取消引用指针：

cout << *(printpart1 + i) << endl;
        ^

此外，您将参数声明为 指针数组，您应该删除数组部分：

printpart1(int length, string *printpart1)
                                         ^

...并将函数调用更改为

printpart1(ARRAY_SIZE, part1PTR);
                       ^

Answer 2

请在下方查看。

cout << (*printart1)[i]<< endl;

Answer 3

您似乎对如何声明和使用数组 string 和指针数组 string 感到困惑。

    string part1[ARRAY_SIZE] = { "...", "...", ...

您将part1 声明为字符串数组。但是，如何将该数组传递给printpart1() 似乎有些混乱。您提供的声明为：

void printpart1(..., string *printpart1[18]) {

其中printpart1 指定参数printpart1 将是一个指向字符串的指针数组。然后您将printpart1() 称为：

printpart1(ARRAY_SIZE, &part1PTR);

您已将part1PTR 声明为指向字符串的指针。通过传递part1PTR 的地址，您为printpart1() 提供了一个指向string 的指针。

为了获得实际的打印字符串，您首先必须取消引用printpart1（例如*printpart1）以获得指向字符串的指针，然后再应用任何偏移和取消引用，例如*(*printpart1 + i)。

例如，以下将提供所需的字符串输出：

void printpart1(int length, string *printpart1[18]) {
    int dummy;
    for (int i = 0; i < length; i++)
        cout << *(*printpart1 + i) << endl;

    cin >> dummy;

}

（注意：*(*printpart1 + 1) 等价于(*printpart1)[i]。任何对您更有意义的形式。通常使用第二种形式）

简单地传递数组

现在所有这些都过于复杂了，就像将数组本身传递给 printpart1() 一样简单，例如如果您将功能更改为：

void printpart1(int length, string *printpart1) {
    int dummy;
    for (int i = 0; i < length; i++)
        cout << printpart1[i] << endl;

    cin >> dummy;
}

您不再需要part1PTR，只需使用以下命令调用您的函数：

    printpart1 (ARRAY_SIZE, part1);

仔细检查，仔细考虑，如果您还有其他问题，请告诉我。