又是我!
我对C++还是很陌生,昨天刚交了一份作业,创建了一个菜单,其中有7个选项可供选择。我能够完成所需的所有任务,但选项7除外,后者是将一个阵列复制到另一个阵列并退出新阵列。
我知道我的代码在情况7中不会显示它,但是是否有人可以让我知道如何使用当前的代码完成任务?它不再对我的任务有所帮助,但是我觉得这是我应该能够做的。也许我在屏幕前花了太长时间,无法寻找答案,但是在任何情况下,我都会为我将来的程序获得任何帮助。
#include <iostream>
#include <string>
#include <cstdlib>
#include <iomanip>
using namespace std;
int main(void)
{
// Delcarations
string MasterFile[6]; // MasterFile Array
MasterFile[0] = "I want to thank all the C++ students who has helped me this semester. You have inspired me to work harder and to be able to design small C++ programs using a gamming approach.";
string master = MasterFile[0];
string str1 = "my Instructor, Professor Penn";
string str2 = "I want to thank all the C++ students who has helped me this semester. You have inspired me to work harder and to be able to design efficient C++ programs using a gamming approach.";
char masterfile[] = { "I want to thank all the C++ students who has helped me this semester. You have inspired me to work harder and to be able to design small C++ programs using a gamming approach." };
char StudentFile[1] = {masterfile[1]}; // StudentFile Array
char selection;
// Defines the width of the menu
const int menuWidth = 84;
// This is a loop structure for the menu box using ASCII
// This prints the top left corner of the menu box (ASCII)
cout << char(201);
// This prints the top border of the menu box (ASCII)
for (int column = 0; column < menuWidth; ++column) {
cout << char(205);
}
// This prints the top right corner of the menu box (ASCII)
cout << char(187);
cout << "\n";
// array with menu options
string menu[20];
menu[0] = " **************";
menu[1] = " *** MAIN MENU ***";
menu[2] = " **************";
menu[3] = " Please Choose From The Following Options:";
menu[6] = " 1. Master File Array Statement:";
menu[8] = " 2. Length of Master File Array:";
menu[10] = " 3. Replacing Phrase 'all the C++ students' with 'my Instructor, Professor Penn':";
menu[12] = " 4. Swaping 'small' with 'efficient':";
menu[14] = " 5. Find and Display the Position of 'th': ";
menu[16] = " 6. Erase the Phrase 'using a gaming approach':";
menu[18] = " 7. Copy MasterFile Array to Student Array:";
for (string option : menu)
{
cout << char(186) // print left border
<< setw(menuWidth) // set next item width
<< left // set next item aligment
<< option // print menu option string with width and aligment
<< char(186) << "\n"; // print right border
}
// This will print the bottom left corner of the menu box (ASCII)
cout << char(200);
// This prints the bottom border of the menu box (ASCII)
for (int column = 0; column < menuWidth; ++column) {
cout << char(205);
}
// This prints the bottom right corner of the menu box (ASCII)
cout << char(188);
cout << "\n\n";
/*
END OF MENU
*/
cout << "\t\t\t Enter Your Selection: ", cin >> selection, cout << endl;
do
{
switch (selection)
{
case '1':
cout << "You have chosen to create Masterfile Array:\n\n";
cout << master; cout << endl;
cout << "\n\n";
break;
case '2':
cout << "You have chosen to display the length:\n\n";
cout << "The number of characters in MasterFile Array is: ";
cout << master.length(), cout << endl;
cout << "\n\n";
break;
case '3':
cout << "You have chosen to replace 'all the C++ students' with 'my Intructor, Professor Penn':\n\n";
cout << master.replace(16, 20, str1), cout << endl;
cout << "\n\n";
break;
case '4':
master.swap(str2);
cout << "You have to swap the word 'small' with 'efficient':\n\n";
cout << master; cout << "\n\n";
break;
case '5':
cout << "You have chosen to find and display the 'th' position:\n\n";
cout << "'th' starts in position: ";
cout << master.find("th"); cout << " of the array."; cout << endl;
cout << "\n\n";
break;
case '6':
cout << "You have chosen to erase the phrase 'using a gaming approach:\n\n";
cout << master.erase(149) << ".", cout << "\n\n";
break;
case '7':
cout << "\nYou have chosen to copy StudentFile Array into MasterFile Array:\n\n";
cout << master;
default: cout << "\n Invalid selection\n\n";
}
} while ((selection = main()) != 7);
return 0;
}
最佳答案
方法1:最简单的方法
如对此StackOverflow question的第一个答案所述,如果您使用的是C++ 11,则可以使用std::array
将一个数组复制到另一个数组。您完全不必担心使用strcpy
。
std::array<int,4> A = {1,2};
std::array<int,4> B = A; // This copies array A into array B.
因此,对于您的特定代码,您可以简单地创建一个新的字符串数组并将其设置为master
。Here是
std::array
的相关文档。方法2:使用strcpy
另外,如果您确实想使用
strcpy,
,请改用strcpy_s
,因为strcpy现在被认为是不安全且过时的功能。您可以这样称呼它:strcpy_s(FirstThing, SecondThing);
它将把SecondThing的内容复制到FirstThing中。
关于c++ - 有没有办法使用strcpy将一个字符串数组复制到另一个字符串或另一个数组中?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62617734/