选择一个随机数而不是数字3

Question

你会添加什么来使它仍然选择一个随机数而不是数字3？

- (IBAction)Button3 {
{
    int randomviews = rand() % 6;
    Label1.text = [NSString stringWithFormat:@"%i", randomviews];
}

Answer 1

这是另一种方法，只需一次调用rand()即可。由于您要从您的范围中排除一个数字，请求较小的数字范围，然后将所有生成的数字替换为前一个范围的最高数字：

- (IBAction)Button3 {
{
    int randomviews = rand() % 5;
    if (randomviews == 3) {
        randomviews = 5
    }
    Label1.text = [NSString stringWithFormat:@"%i", randomviews];
}

Answer 2

- (IBAction)Button3 {
    int randomviews;

    do {
        randomviews = rand() % 6;
    }
    while (randomviews == 3);
    Label1.text = [NSString stringWithFormat:@"%i", randomviews];
}

如果你想排除零：

- (IBAction)Button3 {
    int randomviews;

    do {
        randomviews = rand() % 6;
    }
    while (randomviews == 3 || randomviews == 0);
    Label1.text = [NSString stringWithFormat:@"%i", randomviews];