Thread: subsequences in C

i have to find all the subsequences of all the prime numbers who has at least two digits(so i start from 11).we must define a max number ex.define maxnum 100.i am prohibited from use arrays and im a begginer. my code:

Code:

#include <stdio.h>#define MAXNUMB 100


int main (void) 
{
  int i,j,k,l,num,mult=1,mask,sub=0,tempnum,combs=0,max=1;
     for (i=11 ; i<MAXNUMB; i+=2) 
      { 
        for (j=3;j*j<=i;j+=2) 
         {  
           if (i%j==0) 
           
           
             break; 
           
          }
         
           if (j*j>i) 
           {   
            tempnum=i; 
            while(tempnum!=0) 
              {
                   tempnum/=10;
                 combs++; 
                 }
               for ( k = 1; k <= combs; k++ ) 
              {
                    max *= 2;
          }
               for (k=1;k<combs-1;k++) 
               {
                 mask=k;
                 mult=1;
                 sub=0;
                 num=i;
                 while (num!=0)
                    {
                     if (mask%2==1)
                       {
                         sub+=(num%10)*mult;
                         mult*=10;
                       }
                    num/=10;
                    mask/=2;
                    }
                 printf ("%d \n",sub);
            }
             
       } 
     
    
  }
}

what i did wrong?can someone explain to me why the code doesnt gime the subsequences of 11-13-17 etc?