输入一个数组长度，动态创建数组，所有元素随机生成，输出元素中的最大值

int length =
0;

printf("输入一个数组长度:");

scanf("%d", &length);

int *p = malloc(sizeof(int) * length);

for (int i =
0; i < length; i++) {
*(p + i) =
arc4random() % 21 +
20;

printf("%d ", *(p + i));
}

int max = 0;

for (int i =
0; i < length; i++) {

if (max < *(p + i)) {
max = *(p + i);
}
}

printf("\n%d", max);

free(p);
p =
NULL;