如何在Rust中迭代它时更改数组内的值

Question

我想在注释中更改循环内的值.它应该很简单,但我没有看到解决方案.

fn main() {
    let mut grid: [[i32; 10]; 10] = [[5; 10]; 10];
    for (i, row) in grid.iter_mut().enumerate() {
        for (y, col) in row.iter_mut().enumerate() {
            //grid[i][y] = 7;
            print!("{}", col);
        }
        print!("{}","\n");
    }
}

Answer 1

该iter_mut迭代器给你的元素,您可以使用突变格的引用.你通常不应该使用索引.

fn main() {
    let mut grid: [[i32; 10]; 10] = [[5; 10]; 10];
    for row in grid.iter_mut() {
        for cell in row.iter_mut() {
            *cell = 7;
        }
    }

    println!("{:?}", grid)
}

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