C++ C++；在乘法图中放置随机值（嵌套循环）
我为整数1…10创建了一个乘法表。代码如下：C++ C++；在乘法图中放置随机值（嵌套循环）,c++,C++,我为整数1…10创建了一个乘法表。代码如下： for (int i = 1; i <= 10; i++) { for (int j = 1; j <= 10; j++) { std::cout << "\t" << i * j; } std::cout << std::endl; } 我正在努力解决的问题是，我需要在乘法表中插入一个表示错误值的随机数。例如： 1 2 3 4
for (int i = 1; i <= 10; i++) {
for (int j = 1; j <= 10; j++) {
std::cout << "\t" << i * j;
}
std::cout << std::endl;
}
1 2 3 4 5 6 7 8 9 10
2 4 6 8 10 12 14 16 18 20
3 6 9 13 15 18 21 24 27 30
std::random_device rd;
std::mt19937 gen(rd());
// it produces uniformly distributed random integers in the range [a, b] (both inclusive)
std::uniform_int_distribution<> dis(0, 1); // either add 0 or 1 (1 will be the error -- can change a,b according to your need)
for (int i = 1; i <= 10; i++)
{
for (int j = 1; j <= 10; j++)
{
std::cout << "\t" << i * j + dis(gen); // just add the error value to your multiplication
}
std::cout << std::endl;
}
std:：随机设备rd；
标准：mt19937 gen（rd（））；
//它产生[a，b]范围内均匀分布的随机整数（包括两者）
标准：均匀分布图（0，1）；//添加0或1（错误为1--可以根据需要更改a、b）
对于（int i=1；i#包括//输入/输出
#包括
结构字段数据{
使用行=无符号整数；
使用Col=无符号整数；
常量行行{10}；
const cols{10}；
行错误行；
错误的颜色；
无符号int err_值；
FieldData（）{}//对行/列使用默认值
FieldData（Row max_Row，Col max_Col）：行（std:：move（max_Row）），列（std:：move（max_Col））{}//为行/列使用给定的值
};
无效打印字段（常量字段数据和数据）
{
对于（FieldData:：Row Row=1；Row
我应该使用另一个循环来插入随机数吗？如果是，如何进行
您只插入了一个错误，因此对此进行循环没有多大意义
那么，为什么不先决定随机数的去向呢？一旦知道了，就可以修改内部循环体，如下所示：
int value = i * j;
if ((i == error_location.row) and (j = error_location.column)) {
value = // code for introducing an error, e.g. sample a random answer,
// or a random offset added to the correct answer etc.
}
std::cout << "\t" << i * j;
int值=i*j；
if（（i==error\u location.row）和（j=error\u location.column））{
value=//引入错误的代码，例如，随机抽取一个答案，
//或者在正确答案上添加随机偏移量等。
}
std：：cout所以感谢大家的投入——特别是@Wolfgang。
我确实读过C++11的随机头文件及其函数。
我确实创建了一个带有随机函数的源代码，还有一个没有。
任何关于如何使我的源代码更高效的反馈都将不胜感激。
除此之外，它实现了我需要它做的事情
#include <iostream>
#include <ctime>
#include <iomanip>
const unsigned int ROWS = 10;
const unsigned int COLUMNS = 10;
void randomValue(unsigned int &, unsigned int &, unsigned int &);
int main()
{
unsigned int rValue;
unsigned int cValue;
unsigned int pValue;
unsigned int rowError;
unsigned int columnError;
unsigned int productError;
unsigned int userRowGuess;
unsigned int userColumnGuess;
char choice;
do
{
randomValue(rValue, cValue, pValue);
std::cout << "\033[2J\033[0;0H"; // This code clears the screen
std::cout << std::endl << std::endl;
std::cout << std::setw(35) << "++++++++++++++++++++++++" << std::endl;
std::cout << std::setw(35) << "+ Multiplication Table +" << std::endl;
std::cout << std::setw(35) << "++++++++++++++++++++++++" << std::endl;
std::cout << std::endl << std::endl;
while (true)
{
rowError = rValue;
columnError = cValue;
productError = pValue;
if (productError == rowError * columnError)
{
productError--;
}
for (unsigned int row = 1; row <= ROWS; row++)
{
for (unsigned int column = 1; column <= COLUMNS; column++)
{
if (row == rowError && column == columnError)
{
std::cout << "\t" << "" << productError;
}
else
{
std::cout << "\t" << row * column;
}
}
std::cout << std::endl;
}
break;
}
std::cout << std::endl << std::endl;
std::cout << "\t\t" << "Type in the column number " << std::endl;
std::cout << "\t\t" << "of the location of the " << std::endl;
std::cout << "\t\t" << "error & then press " << std::endl;
std::cout << "\t\t" << "[Enter]: ";
std::cin >> userColumnGuess;
std::cout << std::endl;
std::cout << "\t\t" << "Type in the row number " << std::endl;
std::cout << "\t\t" << "of the location of the " << std::endl;
std::cout << "\t\t" << "error & then press " << std::endl;
std::cout << "\t\t" << "[Enter]: ";
std::cin >> userRowGuess;
std::cout << std::endl;
if (userRowGuess != rowError && userColumnGuess != columnError)
{
std::cout << "\t\t" << "Your answer was incorrect!" << std::endl << std::endl;
std::cout << "\t\t" << "Error value '" << productError << "' is located" << std::endl;
std::cout << "\t\t" << "on row " << rowError << ", column " << columnError << "." << std::endl;
}
else
{
std::cout << "\t\t" << "You are correct! You win!" << std::endl;
}
std::cout << std::endl;
std::cout << "\t\t" << "Would you like to play again?" << std::endl << std::endl;
std::cout << "\t\t" << "Type in 'Y' for yes or 'N'" << std::endl;
std::cout << "\t\t" << "for no & then press [Enter]: ";
std::cin >> choice;
while (choice != 'y' && choice != 'Y' && choice != 'n' && choice != 'N')
{
std::cout << std::endl;
std::cout << "\t\t" << "Invalid entry. Only 'Y' or 'N'" << std::endl;
std::cout << "\t\t" << "are accepted answers." << std::endl << std::endl;
std::cout << "\t\t" << "Would you like to play again?" << std::endl << std::endl;
std::cout << "\t\t" << "Type in 'Y' for yes or 'N' for" << std::endl;
std::cout << "\t\t" << "no & then press [Enter]: ";
std::cin >> choice;
}
std::cout << std::endl;
} while (choice == 'y' || choice == 'Y');
std::cout << "\t\t" << "Press [Enter] to continue....." << std::endl;
std::cin.get();
std::cin.get();
return 0;
}
void randomValue(unsigned int &rValue, unsigned int &cValue, unsigned int &pValue)
{
srand((unsigned)time(NULL));
unsigned int r = rValue = (rand() % ROWS) + 1;
unsigned int c = cValue = (rand() % COLUMNS) + 1;
unsigned int p = pValue = (rand() % (ROWS * COLUMNS)) + 1;
}
#包括
#包括
#包括
常量无符号整数行=10；
const unsigned int COLUMNS=10；
无效随机值（无符号整数&，无符号整数&，无符号整数&）；
int main（）
{
无符号整数右值；
无符号int值；
无符号整数值；
无符号整数行错误；
无符号整数列错误；
无符号整数错误；
无符号整数userRowGuess；
unsigned int userColumnGuess；
字符选择；
做
{
随机值（右值、cValue、pValue）；
std:：cout根据什么情况应该插入错误？您的解释/动机非常模糊，我无法理解您正在尝试做什么。最好提供您已经做了什么，以及您到底需要实现什么，以便我们能够提供帮助。很抱歉，我的程序目标缺乏详细信息。此乘法表rt已被要求具有错误值，因为程序将通过询问行号和列号提示用户指定值错误的位置。如果用户输入的信息错误，程序将提示行和列的正确位置。如果正确，将显示祝贺。这意味着增强我对使用嵌套循环的理解。（行==4&&col==3）
让程序指定一些随机值，总是在3x4位置，而不是其他位置，这与OP的要求相矛盾。我问过位置应该基于什么条件……也许我理解错了？！这个乘法表从一开始就必须有一个错误值，因为程序会提示用户使用sp通过询问行号和列号来指定值错误的位置。如果用户输入的信息错误，程序将提示行和列的正确位置。如果正确，将显示祝贺。此程序将处于do while循环中-询问用户是否希望再次播放。因此，它是对于随机数的位置，每次都要在不同的位置上进行定位。我必须声明我是新的，不知道随机的头文件和它的函数是什么。我用Tony Gladis开始W/C++第九。我还没有遇到STD：：RealthyDead，Autoto，SimultIn ItIdDuffuutuug等等。@沃尔夫冈的代码提供了ACTTL。我要找的是什么！说得对！唯一的一件事是我不知道你写了什么。我还没有进入结构，我才刚刚开始学习类。我还没有听说或读过使用、自动、随机设备rd、mt199937生成器等术语。有没有一种方法可以产生与代码产生的结果相同的结果，但在某种程度上只包含循环，如果它，否则，也许只是课堂。我是C++的新手，我的大脑正在试图了解你写的东西。你能给我一个能最好地教我这些信息的链接吗？
#include <iostream> // input/output
#include <random>
int main()
{
std::random_device rd;
std::mt19937 generator(rd());
unsigned int rows = 10;
unsigned int cols = 10;
std::uniform_int_distribution<unsigned int> dist_rows(1, rows); // random for row (1 to value of field_rows)
std::uniform_int_distribution<unsigned int> dist_cols(1, cols); // random for col (1 to value of field_cols)
std::uniform_int_distribution<unsigned int> dist_result(1, rows * cols); // random for result
while (true) // infinite loop - must be interrupted explicitly with break or similar
{
unsigned int err_row = dist_rows(generator); // Generate the random number that defines the row
unsigned int err_col = dist_cols(generator); // Generate the random number that defines the col
unsigned int err_value = dist_result(generator); // Generate the random value
if (err_value != err_row * err_col)
err_value--; // avoid correct value on error position - simple decrement the value
// print_field
for (unsigned int row = 1; row <= rows; row++)
{
for (unsigned int col = 1; col <= cols; col++)
{
if (row == err_row && col == err_col) // condition to insert the error value
std::cout << "\t" << err_value;
else
std::cout << "\t" << row * col;
}
std::cout << std::endl;
}
//
// some code to ask the user and so on.... (std::cin ...)
//
std::cout << "Error value '" << err_value << "' is on row " << err_row << ", col " << err_col << std::endl;
// if (... some code to check if user wants to break...)
break;
// code to go on
// go on
std::cout << std::endl;
}
}
int value = i * j;
if ((i == error_location.row) and (j = error_location.column)) {
value = // code for introducing an error, e.g. sample a random answer,
// or a random offset added to the correct answer etc.
}
std::cout << "\t" << i * j;
constexpr const int table_leg { 10 };
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<> coordinate_distribution(0, table_leg - 1);
struct { int row, col; } error_location =
{ coordinate_distribution(gen), coordinate_distribution(gen) };
#include <iostream>
#include <ctime>
#include <iomanip>
const unsigned int ROWS = 10;
const unsigned int COLUMNS = 10;
void randomValue(unsigned int &, unsigned int &, unsigned int &);
int main()
{
unsigned int rValue;
unsigned int cValue;
unsigned int pValue;
unsigned int rowError;
unsigned int columnError;
unsigned int productError;
unsigned int userRowGuess;
unsigned int userColumnGuess;
char choice;
do
{
randomValue(rValue, cValue, pValue);
std::cout << "\033[2J\033[0;0H"; // This code clears the screen
std::cout << std::endl << std::endl;
std::cout << std::setw(35) << "++++++++++++++++++++++++" << std::endl;
std::cout << std::setw(35) << "+ Multiplication Table +" << std::endl;
std::cout << std::setw(35) << "++++++++++++++++++++++++" << std::endl;
std::cout << std::endl << std::endl;
while (true)
{
rowError = rValue;
columnError = cValue;
productError = pValue;
if (productError == rowError * columnError)
{
productError--;
}
for (unsigned int row = 1; row <= ROWS; row++)
{
for (unsigned int column = 1; column <= COLUMNS; column++)
{
if (row == rowError && column == columnError)
{
std::cout << "\t" << "" << productError;
}
else
{
std::cout << "\t" << row * column;
}
}
std::cout << std::endl;
}
break;
}
std::cout << std::endl << std::endl;
std::cout << "\t\t" << "Type in the column number " << std::endl;
std::cout << "\t\t" << "of the location of the " << std::endl;
std::cout << "\t\t" << "error & then press " << std::endl;
std::cout << "\t\t" << "[Enter]: ";
std::cin >> userColumnGuess;
std::cout << std::endl;
std::cout << "\t\t" << "Type in the row number " << std::endl;
std::cout << "\t\t" << "of the location of the " << std::endl;
std::cout << "\t\t" << "error & then press " << std::endl;
std::cout << "\t\t" << "[Enter]: ";
std::cin >> userRowGuess;
std::cout << std::endl;
if (userRowGuess != rowError && userColumnGuess != columnError)
{
std::cout << "\t\t" << "Your answer was incorrect!" << std::endl << std::endl;
std::cout << "\t\t" << "Error value '" << productError << "' is located" << std::endl;
std::cout << "\t\t" << "on row " << rowError << ", column " << columnError << "." << std::endl;
}
else
{
std::cout << "\t\t" << "You are correct! You win!" << std::endl;
}
std::cout << std::endl;
std::cout << "\t\t" << "Would you like to play again?" << std::endl << std::endl;
std::cout << "\t\t" << "Type in 'Y' for yes or 'N'" << std::endl;
std::cout << "\t\t" << "for no & then press [Enter]: ";
std::cin >> choice;
while (choice != 'y' && choice != 'Y' && choice != 'n' && choice != 'N')
{
std::cout << std::endl;
std::cout << "\t\t" << "Invalid entry. Only 'Y' or 'N'" << std::endl;
std::cout << "\t\t" << "are accepted answers." << std::endl << std::endl;
std::cout << "\t\t" << "Would you like to play again?" << std::endl << std::endl;
std::cout << "\t\t" << "Type in 'Y' for yes or 'N' for" << std::endl;
std::cout << "\t\t" << "no & then press [Enter]: ";
std::cin >> choice;
}
std::cout << std::endl;
} while (choice == 'y' || choice == 'Y');
std::cout << "\t\t" << "Press [Enter] to continue....." << std::endl;
std::cin.get();
std::cin.get();
return 0;
}
void randomValue(unsigned int &rValue, unsigned int &cValue, unsigned int &pValue)
{
srand((unsigned)time(NULL));
unsigned int r = rValue = (rand() % ROWS) + 1;
unsigned int c = cValue = (rand() % COLUMNS) + 1;
unsigned int p = pValue = (rand() % (ROWS * COLUMNS)) + 1;
}