Why operators are needed in Go - Challenge Your Understanding

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Go code using operators?

Look at this Go program that uses operators to calculate a value. What will it print?

Go

package main
import "fmt"
func main() {
  a := 10
  b := 3
  c := a / b
  fmt.Println(c)
}

A Compilation error

B 3.3333333333333335

C 4

D 3

💡 Hint

Remember that dividing two integers in Go results in an integer.

In Go, dividing two integers uses integer division, so 10 / 3 equals 3, not 3.33.

🧠 Conceptual

intermediate

Why do we need operators in programming?

Which of these best explains why operators are needed in programming?

A To create user interfaces automatically

B To store data permanently on disk

C To perform calculations and manipulate data easily

D To connect to the internet

💡 Hint

Think about what operators do with numbers and variables.

Operators let us do math and change data values, which is essential for programming logic.

❓ Predict Output

advanced

What is the output of this Go code using bitwise operators?

Examine this Go program that uses bitwise operators. What will it print?

Go

package main
import "fmt"
func main() {
  x := 5  // binary 0101
  y := 3  // binary 0011
  z := x & y
  fmt.Println(z)
}

A 1

B 7

C 0

D 8

💡 Hint

Bitwise AND compares each bit of two numbers.

5 in binary is 0101, 3 is 0011. ANDing them gives 0001 which is 1.

🔧 Debug

advanced

What error does this Go code cause and why?

Look at this Go code snippet. What error will it cause when compiled?

Go

package main
func main() {
  var a int = 5
  var b float64 = 2.0
  c := a + b
}

A Cannot use a (type int) + b (type float64) without conversion

B Syntax error: missing semicolon

C Runtime panic: invalid operation

D No error, prints 7

💡 Hint

Check if Go allows adding int and float64 directly.

Go does not allow adding int and float64 without explicit conversion.

🚀 Application

expert

How many items are in the resulting map after this Go code runs?

This Go code uses operators to fill a map. How many key-value pairs does the map contain after running?

Go

package main
import "fmt"
func main() {
  m := make(map[int]int)
  for i := 0; i < 5; i++ {
    if i%2 == 0 {
      m[i] = i * 2
    }
  }
  fmt.Println(len(m))
}

A 5

B 3

C 2

D 0

💡 Hint

Count how many numbers from 0 to 4 are even.

Only 0, 2, and 4 are even, so the map has 3 entries.