learngo/08-numbers-and-strings/01-numbers/questions/03-assignment-operations.md

Which expression increases n by 1?

var n float64

1. n = +1
2. n = n++
3. n = n + 1 CORRECT
4. ++n

1: This just assigns 1 to n.

2: IncDec statement can't be used as an operator.

4: Go doesn't support prefix incdec notation.

Which expression decreases n by 1?

var n int

1. n = -1
2. n = n--
3. n = n - 1 CORRECT
4. --n

1: This just assigns -1 to n.

2: IncDec statement can't be used as an operator.

4: Go doesn't support prefix incdec notation.

Which code below equals to n = n + 1?

1. n++ CORRECT
2. n = n++
3. ++n
4. n = n ++ 1

2: IncDec statement can't be used as an operator.

3: Go doesn't support prefix incdec notation.

4: What's that? ++?

Which code below equals to n = n + 1?

1. n = n++
2. n += 1 CORRECT
3. ++n
4. n = n ++ 1

1: IncDec statement can't be used as an operator.

3: Go doesn't support prefix incdec notation.

4: What's that? ++?

Which code below equals to n -= 1?

1. n = n--
2. n += 1--
3. n-- CORRECT
4. --n

1: IncDec statement can't be used as an operator.

2: IncDec statement can't be used as an operator. And also, you can't use it with 1--. The value should be addressable. You're going to learn what that means soon.

4: Go doesn't support prefix incdec notation.

Which code below divides the length by 10?

1. length = length // 10
2. length /= 10 CORRECT
3. length //= 10

1: What's that? //?

2: That's right. This equals to: length = length / 10

3: What's that? //=?

Which code below equals to x = x % 2?

1. x = x / 2
2. x =% 2
3. x %= 2 CORRECT

1: This is a division. You need to use the remainder operator.

2: Close... But, the % operator is on the wrong side of the assignment.

Which function below converts a string value into a float value?

1. fmtconv.ToFloat
2. conv.ParseFloat
3. strconv.ParseFloat CORRECT
4. strconv.ToFloat

Which code is correct?

If you don't remember it, this its function signature:

func ParseFloat(s string, bitSize int) (float64, error)

1. strconv.ParseFloat("10", 128)
2. strconv.ParseFloat("10", 64) CORRECT
3. strconv.ParseFloat("10", "64")
4. strconv.ParseFloat(10, 64)

1: There are no 128-bit floating point values in Go (Actually there are, but they only belong to the compile-time).