c# - Determine whether a number contains specific prime factors -


below code, , can't work way should.

i have find prime numbers (this works fine). then, if prime numbers 7 , 3
(63 = 7 * 3 * 3 or 7 = 7) number magical, , if contains others (98 = 7 * 7 * 2 or 42 = 7 * 3 * 2) it's not.

i'm kind of stuck here:

if (b != 7 && b != 3)                          console.writeline(k);  else                         console.writeline(j);

i don't know how fix it. here whole code:

         string k="isnt magical";         string j = "is magical";         int a, b;         console.writeline("vnesite svoje stevilo: ");         = convert.toint32(console.readline());         (b = 2; > 1; b++)/             if (a % b == 0)             {                  while (a % b == 0)                 {                     /= b;                  }                   if (b != 7 && b != 3)                     console.writeline(k);                 else                     console.writeline(j);        }

you printing "isnt magical" or "is magical" every factor. code should this:

string k = "isnt magical"; string j = "is magical"; int a, b; console.writeline("vnesite svoje stevilo: "); = convert.toint32(console.readline());  var allmagical = true; for(b = 2; > 1; b++) if(a % b == 0) {     while(a % b == 0) /= b;     if(b != 7 && b != 3) allmagical = false; }  console.writeline(allmagical ? j : k);

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