PAT B1001

#include
#include
using namespace std;
int main() {
	int tem;
	int n, num = 0;
	scanf("%d",&n);
	while (n != 1) {
		if (n % 2 == 0)
			n = n / 2;
		else
			n =( 3 * n + 1)/2;
		num++;
	}
	printf("%d", num);
	cin >> tem;
	return 0;
}

总结：

1.输入要加&

2.条件判断while(n!=1)