is this my mistake or software's mistake

i'm pretty sure it's not my mistake, i beleve that 1.9999... = 2 because

1/3 = 0.3333...

2/3 = 0.6666...

3/3 = 0.9999... = 1

so yeah, i want to know is this my mistake or software's mistake

i'm pretty sure it's not my mistake, i beleve that 1.9999... = 2 because

1/3 = 0.3333...

2/3 = 0.6666...

3/3 = 0.9999... = 1

so yeah, i want to know is this my mistake or software's mistake