The 3n + 1 problem

解题思路:

注意事项:

参考代码:

#include<stdio.h>

int prime(int a)

{

int c = 0;

while (a != 1)

{

c++;

if (a % 2 == 0)

a = a / 2;

else

a = a * 3 + 1;

}

return c+1;

}

int main()

{

int a,b,max;

while (scanf("%d %d", &a, &b) == 2)

{

max = 0;

printf("%d %d ", a, b);

if (a > b)

{

int c;

c = a;

a = b;

b = c;

}

for (a; a <= b; a++)

{

int tem;

tem = prime(a);

if (max < tem)

max = tem;

}

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

}

}