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ok i know what modulus does, but i don't know how to use it to my advange so here is my question #include <iostream> using namespace std; int main() { unsigned short small; unsigned long large; unsigned long skip; unsigned long target; const unsigned short MAXSMALL=65535; cout << "Enter a small number: "; cin >> small; cout << "Enter a large number: "; cin >> large; cout << "Enter a skip number: "; cin >> skip; cout << "Enter a target number: "; cin >> target; cout << endl; while (small < large && large > 0 && small < MAXSMALL) { small++; // incremeting small if (small % skip == 0) // my question is what does this do? { cout << "skipping on " << small << endl; continue; } if (large == target) { cout << "Target reached!\n"; break; } large -= 2; } cout << "Small : " << small << " Large: " << large << endl; system("PAUSE"); return 0; }

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Modulus calculates the remainder of a division.

Examples:
4 % 3 = 1. (4 / 3 = 1, 1 left over)
4 % 2 = 0. (4 / 2 = 2, 0 left over)
4 % 1 = 0. (4 / 1 = 4, 0 left over)

if (small % skip == 0) // my question is what does this do?{     cout << "skipping on " << small << endl;     continue;}

Think of it in terms of actual numbers.
if (4 % 4 == 0) // my question is what does this do?{     cout << "skipping on " << small << endl;     continue;}

So it'll skip the #4, because 4 % 4 = 0 (4 / 4 = 1, 0 left over).

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Quote:
 Original post by Ekim_GramYou posted the code but we need a more detailed question about what your asking.

ok, im wondering on the line
if (small % skip == 0) // my question is what does this do?
{
cout << "skipping on " << small << endl;
continue;
}
what does (small % skip == 0); do here in detail and why does the % operator does in full detail?

oh dang, ok i see now
thank you! :)

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Oops, didn't see the comment in your code. That's basically saying if there is no remainder when you divide the two numbers, it performs the instructions given to it.

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Quote:
 Think of it in terms of actual numbers.

This is good advice. For example if you want to know what numbers are selected for (a % b == 0), then it will be those a equal to:

0, b, 2*b, 3*b, 4*b, ...

Similarly if you have (a % b == 1), you get:

1, b+1, (2*b)+1, (3*b)+1, ...

HTH,
Jim.

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