生成N位不重复的随机数

+ (void)randomNumber:(int)number
{
//    int random = rand() % number;
//    printf("%d: %d\n", number, random);
    
    int randoms[number];
    for (int i = 0; i < number; i++) {
        
        while (1) {
            bool isRight = YES; // 是否保存
            int random = rand() % number; // 随机数
            for (int j = 0; j < i; j++) {
                // 判断是否重复，重复时，跳出判断循环
                if (randoms[j] == random) {
                    isRight = NO;
                    break;
                }
            }
            
            // 不重复时，保存，并退出while循环
            if (isRight) {
                randoms[i] = random;
                break;
            }
        }
    }
    
    for (int i = 0; i < number; i++) {
        printf("%d: %d\n", number, randoms[i]);
    }
}

[ViewController randomNumber:10];

结果

10: 7
10: 9
10: 3
10: 8
10: 0
10: 2
10: 4
10: 5
10: 6
10: 1