C Language-mice

/* Suppose a pair of rats can have a pair of mice each month. After 3 months of growth, the mouse will be able to give birth to a small mouse from the 4th month onwards.

Q: If all the rats are not dead, then how many rats are there in 20 months? */

#include <stdio.h>

void Main ()

{

int old = 2,first = 0,second = 0,third = 0;

int i= 0;

for (; i < 20;i++)

{

Old = old + third;

Third = second;

second = first; first = old;

}

printf ("The 20th month there are altogether%d rats!") \ n ", old + first + second + third);

}

/* Experience: This topic belongs to Business Modeling:

0月 January February March April May June ...

Old 2 2 2 2 4 6 8

January 0 2 2 2 4 6 8

February 0 0 2 2 2 4 6

March 0 0 0 2 2 2 4

Total 2 4 6 8 12 18 26

*/

C Language-mice