ContextQMD
Back to Learngo

03 Assignment Operations

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

latest2.4 KB
Original Source

Which expression increases n by 1?

go
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?

go
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:

go
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).