How do you code different variables?

I press keys sequences on the keyboard. Exactly what I type depends on what programming language I'm using.

Is this a computer programming question? I ask because every now and then, other types of coding questions get put into "Computers & Internet > Programming & Design" section. (Health systems, insurance, etc. questions are better asked in a different section.)

give them different names

int i;
int j;
int k;

i = 1;
j = 2;
k = 3;