CODEWITHSUNDEEP
c++
jmasterx
jmasterx

Reputation: 54143

Appending a number to a number?

How cold I do the following:

say I have the number 10 and would like to append the number 317 to it. The resulting integer would be 10317. How can this be done. Also, once I have this number, how could I then for example remove the 17 off the end. Without using strings, and without obvious solving and adding.

Thanks

Upvotes: 0

Views: 407

Answers (4)

Argote
Argote

Reputation: 2155

This will append both numbers

int append_a_and_b_as_int(int a, int b)
{
    for(int tmp = b; tmp > 0; tmp % 10)
    {
        a *= 10;
    }
    return a + b;
}

This will get rid of the last n numbers

int remove_n_numbers_from_a(int n, int a)
{
    for(int i = 0; i < n; i++)
    {
        a /= 10;
    }
    return a;
}

Upvotes: 8

fouronnes
fouronnes

Reputation: 4038

Appending :

int foo(int a, int b)
{
    return a*pow(10, floor(log10(b))+1)+b;
}

Removing :

int bar(int a, int b)
{
    return a/pow(10, floor(log10(b))+1);
}

Upvotes: 6

James Walford
James Walford

Reputation: 2953

If this is something you need to do in your workplace I'd advise quitting.

You can treat your two numbers as numeric data and solve the question, or you can treat them as strings and use an append.

Upvotes: 1

Mark Byers
Mark Byers

Reputation: 838806

For the first one:

int a = 10;
int b = 317;
int result = a * 1000 + b;

For the second:

int result2 = result / 100;

Upvotes: 1

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