从文本文件读取矩阵到二维整数数组 C++
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Reading matrix from a text file to 2D integer array C++
提问by burakongun
1 3 0 2 4
0 4 1 3 2
3 1 4 2 0
1 4 3 0 2
3 0 2 4 1
3 2 4 0 1
0 2 4 1 3
I have a matrix like this in a .txt file. Now, how do I read this data into a int**type of 2D array in best way? I searched all over the web but could not find a satisfying answer.
我在 .txt 文件中有一个这样的矩阵。现在，我如何int**以最佳方式将这些数据读入一种二维数组？我搜索了整个网络，但找不到满意的答案。
array_2d = new int*[5];
for(int i = 0; i < 5; i++)
array_2d[i] = new int[7];
ifstream file_h(FILE_NAME_H);
//what do do here?
file_h.close();
回答by Mohamad Ali Baydoun
First of all, I think you should be creating an int*[]of size 7 and looping from 1 to 7 while you initialize an int array of 5 inside the loop.
首先，我认为您应该创建一个int*[]大小为 7 并从 1 到 7 的循环，同时在循环内初始化一个 5 的 int 数组。
In that case, you would do this:
在这种情况下，你会这样做：
array_2d = new int*[7];
ifstream file(FILE_NAME_H);
for (unsigned int i = 0; i < 7; i++) {
array_2d[i] = new int[5];
for (unsigned int j = 0; j < 5; j++) {
file >> array_2d[i][j];
}
}
EDIT (After a considerable amount of time):
Alternatively, I recommend using a vectoror an array:
编辑（经过相当长的时间后）：
或者，我建议使用 avector或 an array：
std::array<std::array<int, 5>, 7> data;
std::ifstream file(FILE_NAME_H);
for (int i = 0; i < 7; ++i) {
for (int j = 0; j < 5; ++j) {
file >> data[i][j];
}
}
回答by George Netu
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
int n;
fscanf(pFile, "%d", &n);
printf("(%d,%d) = %d\n", i, j, n);
array[i][j] = n;
}
I hope it helped.
我希望它有所帮助。
