如何检查 char 数组是否有一个空单元格，以便在其中打印 0? [英] How can I check if the char array has an empty cell so I can print 0 in it?

问题描述

代码:

public void placeO(int xpos, int ypos) {
    for(int i=0; i<3;i++)
        for(int j = 0;j<3;j++) {
            // The line below does not work. what can I use to replace this?
            if(position[i][j]==' ') {
                position[i][j]='0';
            }
        }
}

推荐答案

改成:if(position[i][j] == 0)
每个 char 都可以与一个 int 进行比较.
默认值为 'u0000'，即 char 数组元素的 0.
我猜这正是你所说的 empty cell 的意思.

Change it to: if(position[i][j] == 0)
Each char can be compared with an int.
The default value is 'u0000' i.e. 0 for a char array element.
And that's exactly what you meant by empty cell, I assume.

要对此进行测试，您可以运行它.

To test this you can run this.

class Test {

    public static void main(String[] args) {
        char[][] x = new char[3][3];
        for (int i=0; i<3; i++){
            for (int j=0; j<3; j++){
                if (x[i][j] == 0){
                    System.out.println("This char is zero.");
                }
            }
        }
    }

}

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