"Ending" twin prime

Title Description

If both N and n+2 are prime numbers, they are called twin primes. Input m, output two numbers without exceeding m maximum twin primes. 5≤m≤10000.

Input requirements

Enter a positive integer m

Output requirements

The maximum number of twins for which the output two numbers do not exceed M

If the input

20

should be output

17,19

1#include <stdio.h>2 intIszhishu (intm)3 {4      for(intI=2; i<=m/2; i++)5     if(m%i==0) 6     {7         return 0;8          Break;9     }Ten     return 1; One } A intMain () - { -     intN,i,a=0, b=0; thescanf"%d",&n); -      for(i=n;i>1; i--) -     if(Iszhishu (i) = =1) -     { +A=b; -b=i; +         if(a-b==2) A         { atprintf"%d,%d\n", b,a); -              Break; -         } -     } -     return 0;  -}

"Ending" twin prime