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Golang Operators – Aptitude Questions and Answers

Golang Operators – Aptitude Questions and Answers: This section contains aptitude questions and answers on Golang Operators.
Submitted by Nidhi, on February 19, 2022

1) Which is not a bitwise operator?

Answer & Explanation

2) What will be the output of the following program?

package main

import "fmt"

func main() {
	var X = 10
	var Y = 2
	var Z = 0

	Z = X & Y

	fmt.Printf("%d", Z)
}

Answer & Explanation

Correct answer: 2
2

In the above program, we created 3 variables X, Y, Z initialized with 10, 2, 0. Then we performed the "bitwise AND" (&) operation.

X=10     //0000 1010
Y=2       //0000 0010
    
Now we perform BITWISE AND operation.

0000 1010
0000 0010
=========
0000 0010   That is 2.

3) What will be the output of the following program?

package main

import "fmt"

func main() {
	var TV = 0x01
	var MOBILE = 0x02

	var item = 0x00
	var temp = 0x00

	item = item | TV
	item = item | MOBILE

	fmt.Printf("I have purchased ...:")
	temp = (item & MOBILE)
	if temp != 0 {
		fmt.Printf(" MOBILE, ")
	}

	temp = (item & TV)
	if temp != 0 {
		fmt.Printf(" TV")
	}
}

Answer & Explanation

4) What will be the output of the following program?

package main

import "fmt"

func main() {
	var val = 0x04

	val = val | 0x04

	fmt.Printf("%d,", val)

	val |= 0x01

	fmt.Printf("%d", val)
}

Answer & Explanation

Correct answer: 1
4,5

In the above program, we created a variable val initialized 0x04.

Now we evaluate the expression:

val  = 4  that is 0100

val = val | 0x04;
val = 0x04 | 0x04;

0100
0100
====
0100 That is 4

val = val | 0x01;
val = 0x04 | 0x01;

0100
0001
=====
0101 That is 5

5) What will be the output of the following program?

package main

import "fmt"

func main() {
	var val = 10 ^ 2
	fmt.Printf("val: %d", val)
}

Answer & Explanation

Correct answer: 4
val: 8

In the above program, we performed the BITWISE XOR operation.

1010
0010
====
1000 That is 8.

6) What will be the output of the following program?

package main

import "fmt"

func main() {
    	var val = 0x0f;

	val &= ~0x02;
	fmt.Printf("%d",val);
}

Answer & Explanation

7) Which Bitwise Operator can be used to check whether a number is EVEN or ODD quickly?

Answer & Explanation

8) Left shift (<<) and Right shift (>>) operators are equivalent to ___ by 2.

Answer & Explanation

9) What will be the output of the following program?

package main

import "fmt"

func main() {
    var A int  = 65;
    var B char = (char)A;
     
    fmt.Printf("%c\n",B);    
}

Answer & Explanation

10) What will be the output of the following program?

package main

import "fmt"

func main() {
	var A float32 = 65.12
	var B int = int(A)

	fmt.Printf("%d\n", B)
}

Answer & Explanation

11) What will be the output of the following program?

package main

import "fmt"

func main() {
    var A float32  = 65.12;
    var B int      = (int)A;
     
    fmt.Printf("%d\n",B);   
}

Answer & Explanation

Correct answer: 3
Compilation Error

The above program will generate a compile-time error because of the wrong syntax for typecasting.

var B int      = (int)A;

In the above statement, we did not perform proper typecasting. The correct statement is given below.

var B int      = int(A);

12) What will be the output of the following program?

package main

import "fmt"

func main() {
	var A float32 = 65.12
	var B float64 = float(A)

	fmt.Printf("%f\n", B)
}

Answer & Explanation

Correct answer: 3
Compilation Error

The above program will generate a compile-time error because we cannot type caste 32-bit float into 64-bit float using float(). The correct statement is given below:

var B float64  = float64(A);

13) What will be the output of the following program?

package main

import "fmt"

func main() {
	var num int = int('A' + 2)

	fmt.Printf("%d\n", num)
}