How to concatenate two integers in C

Question

Stack Overflow has this question answered in many other languages, but not C. So I thought I\'d ask, since I have the same issue.

How does one concatenate t

Answer 1

z = x * pow(10, log10(y)+1) + y;

Explanation:

First you get the number of digits of the variable that should come second:

int digits = log10(y)+1;  // will be 2 in your example

Then you "shift" the other variable by multiplying it with 10^digits.

int shifted = x * pow(10, digits);   // will be 1100 in your example

Finally you add the second variable:

z = shifted + y;   // 1111

Or in one line:

z = x * pow(10, (int)log10(y)+1) + y;