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to convert this into positive number I used the abs() method as: a = abs(a);
All you have to do just multiply a negative value with -1 and it will return the positive number instead of the negative.
Assuming the processor is at least somewhat competent and has sizeof(int) == sizeof(Cpu_register) , then a "make this number negative" will be a single instruction (usually called neg ) [well, may need the value loading and storing too, but if you are using the variable for anything else, it can remain after the load, ...
How about
myInt = myInt * -1
int myNegInt = System.Math.Abs(myNumber) * (-1);
int negInt = -System.Math.Abs(myInt)
The same way you make anything else negative: put a negative sign in front of it.
var positive = 6;
var negative = -positive;
Note to everyone who responded with
- Math.Abs(myInteger)
or
0 - Math.Abs(myInteger)
or
Math.Abs(myInteger) * -1
as a way to keep negative numbers negative and turn positive ones negative.
This approach has a single flaw. It doesn't work for all integers. The range of Int32 type is from "-231" to "231 - 1." It means there's one more "negative" number. Consequently, Math.Abs(int.MinValue) throws an OverflowException.
The correct way is to use conditional statements:
int neg = n < 0 ? n : -n;
This approach works for "all" integers.
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