fscanf进入C中的2d数组 [英] fscanf into a 2d array in C

问题描述

我想将txt中的元素扫描到数组中. txt没有我要拥有的行数或列数，它仅包含一个坐标和数组的元素.看起来像这样:

I want to scan elements from a txt into an array. The txt doesn't have how many rows or columns I'm going to have, it only contains a coordinate, and the elements of the array. It looks like this:

2,3
2,1
3,0
-

我如何将这些数字放入数组中，以使array[0][0]将是2而array[1][0]将是3等...

How can i put these numbers into an array so that array[0][0] will be 2 and array[1][0] will be 3 etc...

我也想与其他输入一起使用.

I want to make this work with other inputs as well.

到目前为止我的代码:

??在那里是因为我不知道如果我什至不知道每个输入txt会有多少行或列，我该如何声明它们.

The ?? is there because I have no idea how I should declare these if I don't even know how many rows or columns every input txt will have.

#include <stdio.h>
#include <stdlib.h>

int main()
{
FILE* in = fopen("in.txt", "r");

int x, y;

int array[??][??];

if (in == NULL) {
    printf("Can't open in.txt");
    fclose(in);
    return 1;
}

if (fscanf(in, "%d,%d\n", &x, &y) != 2) {
    printf("Cant read file.");
    return 2;
}

for (int i = 0; i < ??; i++) {
    for (int j = 0; j < ??; j++)
    fscanf(in, "%d", &array[i][j]);
}

return 0;
}

推荐答案

您应使用动态数组分配将元素从未知的txt文件扫描到数组中. 对于C ++程序员而言，最佳解决方案是 std :: vector . 但是C程序员应该使用替代解决方案. 请阅读这篇文章:( std :: vector替代C )

You should use dynamic array allocation to scan elements from an unknown txt file into an array. for C++ programmers the best solution is std::vector. but C programmers should use alternative solutions. please read this post: (std::vector alternative for C)

这篇关于fscanf进入C中的2d数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！