Question

我正在尝试为大学编写一个程序：

首先，输出一个字母数组，我知道了;
然后，它应该提示用户选择与数组中字母表字母相关的数字，虽然它实际上选择了索引号但我得到了这个数字;
接下来，我正在尝试编写一个输出，输出字母表，其他所有字母都是＆＃39; x＆＃39;，即A x C x E x G x I x..........，但是我得到的是A x x x x x x x x x...... {{ 1}}
最后，该程序应该提示用户选择A C E G I........或B D F H J............字母;当我执行它时，它似乎是一个无限循环的计算机语言。

感谢任何帮助。这就是我所拥有的：

#include <iostream> 
#include <cstdio>
#include <iomanip>

using std::cout;
using std::cin;
using std::endl;

int i = 0;
const int size = 27;
char newline = '\n';
char *pnumber = 0;
int selection = 0;

int main()
{
    cout << "PRINGING CONTENTS OF ARRAY" << endl;
    cout << "====================================================" << endl;
    char alphabet[size] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'
        , 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 0 };

    for (int column = 0; column < size; column++) {
        cout << alphabet[column] << " ";
    }
    {
        cout << newline;
        cout << newline;

        cout << "This is the title to your Program related to the alphabet."
            << endl;
        cout << endl;
        cout << "Select the index that coincides with the alphabet."
            << endl;
        cout << "For example, the number 6 should display the letter G"
            << endl;
        cout << endl;
        cout << "Enter a number between 0 and 25: ";
        cin >> i;
        cout << "The number you selected: " << i;
        cout << newline;
        cout << "The letter related to this number: " << alphabet[i];
        cout << endl; }
        {
            cout << newline;
            cout << newline;
            cout << "PRINTING CONTENTS OF ARRAY and adding x to every other element"
            char alphabet[size] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'
                , 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 0 };
            char* pnumber(nullptr);
            pnumber = &alphabet[1];
            for (int i = 0; i < sizeof(alphabet); ++i) {
                *(pnumber + i) = 'x';
            }

            cout << alphabet[i] << " ";
        }
    }

    {
        cout << newline;
        cout << newline;
        cout << "PRINTING CONTENTS OF ARRAY USING THE MOD Option" << endl;
        cout << "=========================================================
        char alphabet[size] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'
            , 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 0 };
        cout << "Do you want the letters of the alphabet starting from index
            0, A, or index 1, B: ";
        cin >> selection;
        if (selection = 0)
            for (int i = 0; i < size; i + 2) {
                cout << alphabet[27] << " ";
            }
        else
            for (int i = 1; i < size; i + 2) {
                cout << alphabet[27] << " ";
            }
        return 0;
    }
} //End of Int Main

Answer 1

#include <iostream> 
#include <cstdio>
#include <iomanip>

using std::cout;
using std::cin;
using std::endl;

int main()
{

int i = 0;
const int size = 27;
char newline = '\n';
char *pnumber = 0;
int selection = 0;


cout << "PRINGING CONTENTS OF ARRAY" << endl;
cout << "====================================================" << endl;

char alphabet[size] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 
                        'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 0 };

for (i = 0; i < size; i++) 
    {
        cout << alphabet[i] << " ";
    }

cout << newline;
cout << newline;

cout << "This is the title to your Program related to the alphabet." << endl;
cout << endl;

cout << "Select the index that coincides with the alphabet." << endl;
cout << "For example, the number 6 should display the letter G" << endl;
cout << endl;

cout << "Enter an index between 0 and 25: ";
cin >> i;
cout << "The number you selected: " << i;

cout << newline;
cout << "The letter at this index: " << alphabet[i];
cout << endl;

cout << newline;
cout << newline;

cout << "PRINTING CONTENTS OF ARRAY and adding x to every other element" << endl;

pnumber = &alphabet[1];

for (i = 0; i < size; i += 1)
{
    if (i % 2 == 0)
    {
        cout << alphabet[i] << " ";
    }
    else
    {
        cout << "x ";
    }
}

cout << newline;
cout << newline;

cout << "PRINTING CONTENTS OF ARRAY USING THE MOD Option" << endl;
cout << "=========================================================" << endl;

cout << "Do you want the letters of the alphabet starting from index 0, A, or index 1, B: ";
cin >> selection;

if (selection = 0)
    for (i = 0; i < size; i += 2) 
    {
        cout << alphabet[i] << " ";
    }
else
    for (i = 1; i < size; i += 2) 
    {
        cout << alphabet[i] << " ";
    }

cout << endl;
cout << endl;
system("pause");
} //End of Int Main

我不确定从哪里开始。但是在这里，从原始帖子中我可以看出，这是自上而下的预期行为。

c ++中的指针和数组也在改变元素

1 个答案: