Neater Way Of Testing If A Variable Is Between Two Constants In If ...

neater way of testing if a variable is between two constants in if statement Projects Programming Benny_H88 June 3, 2015, 10:18pm 1

Just debugging my program, i've written this;

if (0 < columnNumber < 3) {       sectorNumber = 0;           }

Which is obviously wrong as it doesn't work. It made sense in my head when i wrote it but the processor is having none of it.

My fix is this;

if (columnNumber > 0 && columnNumber < 3) {       sectorNumber = 0;           }

My question is; is there a neater way to write it, thats closer to the first one?

Thanks in advance, Ben.

Peter_n June 3, 2015, 10:24pm 2

But the second one is neat ! That is normal 'c' programming.

There is no "check if in between" condition in the 'c' language. Comparing two values is normal, and you have to do that twice when you want to check if it is in between two values. That's how it is, and it's not so bad at all, because it is very straightforward for a programmer and a compiler.

Benny_H88 June 3, 2015, 10:36pm 3

Thanks, i was just sure i had seen something similar to my original statement before.

Benny_H88 June 3, 2015, 10:40pm 4

Take the following statement

if ( x > 5){   //Do stuff }

suppose x = 5.

is the stuff done or not?

Peter_n June 3, 2015, 10:49pm 5

It is possible to compare integers, but also float numbers.

int x = 5; if ( x > 5 ) {   // Do stuff }

The stuff is not done. Only if 'x' is really greater than 5. So 'x' must be 6,7,8,9,10, and so on.

That is why the '>=' often is used (greater or equal than).

With float numbers it is like this:

float z = 5.001; if( z > 5.0) {   // Do stuff }

Here the 5.001 is greater than 5.0, so the stuff is executed.

robtillaart June 4, 2015, 4:46pm 6

comparison can visually show it is between or outside

if (0 <= x && x <= 3) // between if (y < 0 || 10 < y) // outside

or you create a macro (like min, max etc) but be aware all culprits of macros apply...

#define between(x, a, b)  (((a) <= (x)) && ((x) <= (b))) #define outside(x, a, b)  (((x) < (a)) || ((b) < (x)))

Note I interpreted between as between inclusive and outside as outside exclusive. This makes the two macros complementary.

Benny_H88 June 4, 2015, 7:52pm 7

Thanks for the responses, very informative

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