Question

我试过了：

void read_grid_from_file( int** grid, const size_t row, const size_t column, FILE* inf ) {
    size_t x, y;
    for( x = 0; x < row; ++x ) {
        for( y = 0; y < column; ++y ) {
            fscanf( inf, "%d", &grid[x][y] );
            printf( "%d ", grid[x][y] );
        }
        printf( "\n" ); 
    }
}

int main( int argc, char *argv[] ) {
    FILE* inf; // input file stream
    FILE* outf; // output file stream
    char pbm_name[20]; 
    size_t row = 0;
    size_t column = 0;
    /*
    if( argc != 3 ) {
        prn_info( argv[0] );
        exit( 1 );
    }
    */
    inf = fopen( "infile.txt" , "r" );
    outf = fopen( "outfile.txt", "w" );
    fgets( pbm_name, 20, inf ); 
    fscanf( inf, "%d", &row );
    fscanf( inf, "%d", &column );
    int** grid = allocate_memory_for_grid( row, column );
    read_grid_from_file( grid, row, column, inf );
    show_grid( grid, row, column ); //for debugging
}

输入文件是：

P1
12 14
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
1 1 0 0 0 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 0 0 0 0
1 1 1 1 1 1 1 1 0 0 0 0
1 1 0 0 0 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1

输出结果为：

1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 0 0
0 0 0 0 0 0 0 0 1 1 0 0 0 0
0 0 0 0 0 0 1 1 0 0 0 0 0 0
0 0 0 0 1 1 0 0 0 0 0 0 0 0
0 0 1 1 1 1 1 1 1 1 0 0 0 0
1 1 1 1 1 1 1 1 0 0 0 0 1 1
0 0 0 0 0 0 0 0 0 0 1 1 0 0
0 0 0 0 0 0 0 0 1 1 0 0 0 0
0 0 0 0 0 0 1 1 0 0 0 0 0 0
0 0 0 0 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1
Press any key to continue . . .

该矩阵来自何处？

Answer 1

我猜你刚刚改变了你的行和列。输入文件中有12列和14行，而在代码中，您将行作为列和列读取为行。

Answer 2

您已阅读row，然后阅读column。应该反之亦然，column然后row。

Answer 3

对不起伙计们，我想我知道了，文本文件中的行和列被颠倒了!!

Answer 4

您似乎正在阅读.pbm文件。如果许可证适合您的目的，您可以考虑使用netpbm library。

如何使用C从文件中读取二维数组？

4 个答案: