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Topic: accessing variables (Read 253 times) |
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lim
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accessing variables
« on: Jun 30th, 2004, 2:49pm » |
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Please, how could I get the frst (or second) number of a variable?
I mean for istance:
int s = second(); // Values 34 (example)
I want to get the two number: 3 (first) or 4 (second)
Thanks in advance
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TomC
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Re: accessing variables
« Reply #1 on: Jun 30th, 2004, 3:49pm » |
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OK, I was slightly confused by your use of the second() function to get an example number, but I think I know what you mean now.
With integers, it's pretty easy. As with everything, there's more than one way to do it though. Here's one way.
Code:
int example = 34;
int tens = example / 10; // should be right for 0 <= example <= 99
int units = example % 10;
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If you want to do this for a greater range of numbers, you need more use of the modulus operator, to make sure you don't say that e.g. the second digit of '134' is '13'.
For example:
Code:
int example = 12345;
int tenthousands = (example / 10000) % 10;
int thousands = (example / 1000) % 10;
int hundreds = (example / 100) % 10;
int tens = (example / 10) % 10;
int units = example % 10;
println(example + " has:");
println(tenthousands + " tenthousands");
println(thousands + " thousands");
println(hundreds + " hundreds");
println(tens + " tens");
println(units + " units");
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A more general function would go through the number and then return an array. That's an exercise for the reader 
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| « Last Edit: Jun 30th, 2004, 4:13pm by TomC » |
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lim
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Re: accessing variables
« Reply #2 on: Jul 1st, 2004, 10:42am » |
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Hi TomC, thanks for youur quick reply.
I've tried the modulo way, but I can't understand how to get both the number.
I 'mean...
int example = 34;
int units = example % 10;
it gets me only the second number (in this case: 4).
But how to get the first? (in this case number 3). I need to access to both the numbers.
Thanks again.
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TomC
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Re: accessing variables
« Reply #3 on: Jul 1st, 2004, 11:52am » |
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As I showed in the example above, to get the first digit of a 2 digit number, you need to divide by 10.
Integer division will throw away the units when you divide by 10.
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