What is the concept of natural real rational irrational integer?

What is the concept of natural real rational irrational integer?

Integer:...,-2,-1,0,1,2.
Natural number:1,2,3. This doesn't include zero and no more.
Rational: Includes integer and finite decimals and infinite circular decimals. Includes zero
Unjustified number: infinite non-recurring decimal not included
Real numbers: rational and irrational numbers include zero
A real number corresponds to a point on the number axis
In fact, in addition to real numbers, there are imaginary numbers, the two add up to form a complex number

Let a be the smallest natural number, b the largest negative integer, and c the smallest real number.

A is the smallest natural number,
A=0,
Is a maximum negative integer,
B=-1,
C is the real number with the smallest absolute value,
C=0,
A+b+c=0+(-1)+0=-1.
Therefore, the answer is:-1.

A is the smallest natural number,
A=0,
B is the largest negative integer,
B=-1,
C is the real number with the smallest absolute value,
C=0,
A+b+c=0+(-1)+0=-1.
Therefore, the answer is:-1.