fscanf()和realloc() -将文件读取到矩阵

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

int main() {
    FILE *file = fopen("data.txt", "r");
    if (file == NULL) {
        printf("Failed to open file.\n");
        return 1;
    }

    int rows = 0;
    int cols = 0;
    int **matrix = NULL;

    while (!feof(file)) {
        int value;
        if (fscanf(file, "%d", &value) == 1) {
            // Reallocate memory for matrix
            matrix = realloc(matrix, (rows + 1) * sizeof(int *));
            matrix[rows] = realloc(matrix[rows], (cols + 1) * sizeof(int));

            // Store value in matrix
            matrix[rows][cols] = value;
            cols++;
        } else {
            // Move to next row
            rows++;
            cols = 0;
        }
    }

    // Print matrix
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }

    // Free memory
    for (int i = 0; i < rows; i++) {
        free(matrix[i]);
    }
    free(matrix);

    // Close file
    fclose(file);

    return 0;
}