嘿伙计们，我需要帮助为每一代生命游戏打印fstream。目前它只打印出所有死细胞的初始网格。
这是我的打印功能，以及我的尝试。
void print(bool mat[][Row]) //Prints matrix to screen
{
ofstream myfile;
myfile.open("GameOfLife.txt");
cout << setw(3) << " ";
myfile<< setw(3) << " ";
for (int p = 0; 5*p < Row; p++) cout << setw(5) << 5*p+1;
for (int p = 0; 5*p < Row; p++) myfile << setw(5) << 5*p+1;
cout << endl;
myfile<< endl;
for (int m = 0; m < Col; m++)
{
cout << setw(3) << m+1;
myfile<< setw(3) << m+1;
for (int n = 0; n < Row; n++)
{
if (mat[m][n]) cout << "\xDB";
else cout << /*"\xB1"*/"-";
if (mat[m][n]) myfile << "\xDB";
else myfile << /*"\xB1"*/"-";
}
cout << endl;
myfile<<endl;
}
}
这是我在主要
中称呼它的地方 do //Keep updating new generations
{
cout<<"Generation: "<<genX<<endl;
//myfile<<"Generation: "<<genX<<endl;
genX++;
clear(next);
calculate(now, next);
swap(now, next);
print(now);
cin>>cont;
}while(cont == -1);
想知道如何让它将每一代打印到文件中。
编辑：添加整个代码
#include <iostream>
#include <fstream>
#include <iomanip>
#define Col 15 //Col size
#define Row 13 //Row size
using namespace std;
void clear(bool mat[][Row]) //resets with all dead cells
{
for (int m = 0; m < Col; m++)
{
for (int n = 0; n < Row; n++)
mat[m][n] = 0;
}
}
void print(bool mat[][Row]) //Prints matrix to screen
{
ofstream myfile;
myfile.open("GameOfLife.txt");
cout << setw(3) << " ";
myfile<< setw(3) << " ";
for (int p = 0; 5*p < Row; p++) cout << setw(5) << 5*p+1;
for (int p = 0; 5*p < Row; p++) myfile << setw(5) << 5*p+1;
cout << endl;
myfile<< endl;
for (int m = 0; m < Col; m++)
{
cout << setw(3) << m+1;
myfile<< setw(3) << m+1;
for (int n = 0; n < Row; n++)
{
if (mat[m][n]) cout << "\xDB";
else cout << /*"\xB1"*/"-";
if (mat[m][n]) myfile << "\xDB";
else myfile << /*"\xB1"*/"-";
}
cout << endl;
myfile<<endl;
}
}
/*void print2(unsigned int mat[][Row]) //Prints matrix to screen
{
for (int m = 0; m < Col; m++)
{
for (int n = 0; n < Row; n++)
cout << mat[m][n] << " ";
cout << endl;
}
}*/
void calculate(bool mata[][Row], bool matb[][Row])
{
unsigned int neighbors;
for (int m = 0; m < Col; m++)
{
for (int n = 0; n < Row; n++)
{
neighbors = 0;
//Begin counting number of neighbors:
if (mata[m%Col-1][n%Row-1] == 1) neighbors += 1;
if (mata[m%Col-1][n%Row] == 1) neighbors += 1;
if (mata[m%Col-1][n%Row+1] == 1) neighbors += 1;
if (mata[m%Col][n%Row-1] == 1) neighbors += 1;
if (mata[m%Col][n%Row+1] == 1) neighbors += 1;
if (mata[m%Col+1][n%Row-1] == 1) neighbors += 1;
if (mata[m%Col+1][n%Row] == 1) neighbors += 1;
if (mata[m%Col+1][n%Row+1] == 1) neighbors += 1;
//Apply rules to the cell:
if (mata[m%Col][n%Row] == 1 && neighbors < 2)
matb[m%Col][n%Row] = 0;
else if (mata[m%Col][n%Row] == 1 && neighbors > 3)
matb[m%Col][n%Row] = 0;
else if (mata[m%Col][n%Row] == 1 && (neighbors == 2 || neighbors == 3))
matb[m%Col][n%Row] = 1;
else if (mata[m%Col][n%Row] == 0 && neighbors == 3)
matb[m%Col][n%Row] = 1;
}
}
}
void swap(bool mata[][Row], bool matb[][Row]) //Replaces first matrix with second
{
for (int m = 0; m < Col; m++)
{
for (int n = 0; n < Row; n++)
mata[m%Col][n%Row] = matb[m%Col][n%Row];
}
}
int main()
{
bool now[Col][Row], next[Col][Row]; //Creates now and then matrixes
int x, y, cont; //Used for user input
cout << left << "Welcome to Conway's Game of Life." << endl << endl;
cout << "The Rules of Life:" << endl;
cout << "1.cell with less than 2 neighbors die" << endl;
cout << "2. cell with more than three neighbors dies" << endl;
cout << "3. cell with two or three neighbors lives stays alive." << endl;
cout << "4.dead cell with exactly three live neighbors comes to life." << endl << endl;
cout << "To play: Press any key to begin. Enter the column and row of a cell to make \nalive, separated by a space. ";
cout << "enter 1 1 to fill grid with dead cells, enter \"-1\" to begin the \nsimulation. Then enter any number to continue or \"-1\" to move to next generation." << endl;
cin.get();
clear(now);
print(now);
do //Get initial state
{
cin >> x;
if (x == -1) break; //User is done inputting
cin >> y;
now[y-1][x-1] = 1; //Sets cell to alive
print(now); //Updates screen
}while(x != -1);
int genX=1;
do //Keep updating new generations
{
cout<<"Generation: "<<genX<<endl;
//myfile<<"Generation: "<<genX<<endl;
genX++;
clear(next);
calculate(now, next);
swap(now, next);
print(now);
cin>>cont;
}while(cont == -1);
return 0;
}
答案 0 :(得分：2)
每次open一个文件时，它都会被截断，除非您打开进行追加。
由于您希望在每次运行时创建一个新文件但是继续追加它，最简单的方法是将打开的文件传递给print方法。另外，它不必是文件，您可以打印到任何std::ostream
而且，作为额外的奖励，您打印到cout的所有复制也会消失，您可以通过更改main中的一行来摆脱一个输出或另一个输出。
void print(ostream& stream, bool mat[][Row]) //Prints matrix to stream
{
stream << setw(3) << " ";
for (int p = 0; 5*p < Row; p++)
stream << setw(5) << 5*p+1;
stream << endl;
for (int m = 0; m < Col; m++)
{
stream << setw(3) << m+1;
for (int n = 0; n < Row; n++)
{
if (mat[m][n])
stream << "\xDB";
else
stream << "-";
}
myfile << endl;
}
}
以下是main
ofstream myfile("GameOfLife.txt");
do
{
// ... as before ...
print(cout, now); // Print to stdout
print(myfile, now); // print to the file
cin >> cont;
} while (cont == -1);
为了让任何人弄清楚为什么你的最后一代人全都死了，你需要提供第一代样本。