//定義一個有20個元素的數組,每一個元素的取值範圍是[30 ,70],求他們的和
int a[20] = {0};
int sum = 0;
for (int i = 0; i < 20; i++) {
a[i] = arc4random()%(70 - 30 + 1) + 30;
printf("%d ",a[i]);
sum += a[i];
}
printf("\n%d ",sum);
return 0;
}