[英]Reading matrix from a text file to 2D integer array C++
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. 我在.txt文件中有这样的矩阵。 Now, how do I read this data into a
int**
type of 2D array in best way? 现在,如何以最佳方式将此数据读入
int**
类型的2D数组? I searched all over the web but could not find a satisfying answer. 我在网上搜索但找不到令人满意的答案。
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();
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,我认为你应该创建一个大小为7的
int*[]
并在循环中初始化一个5的int数组时从1循环到7。
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): 编辑(经过相当长的时间):
Alternatively, I recommend using a vector
or an array
: 或者,我建议使用
vector
或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];
}
}
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。
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