When I do a simple float sum the result goes wrong

My tests were performed on my pc and sites and ever have the same result
https://www.onlinegdb.com/online_python_compiler

Example 1

a = 3.2
print(a)
b = 0.1
print(b)
c = a + b
print(c)

Result

3.2

0.1

3.3000000000000003

Example 2

a = 3

b = 4

c = 0.1

while a < b:

print(a)

a = a + c

Result

3.1

3.2

3.3000000000000003

3.4000000000000004

3.5000000000000004

3.6000000000000005

3.7000000000000006

3.8000000000000007

3.900000000000001