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1.hellow-world

I am learning Golang .

10.upper-case

lower case to Upper case conversion in golang

11.scope

The f function now has access to the x variable. Now suppose that we wrote this instead:

12.natural_number_sum

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000.

14.constants

Go also has support for constants. Constants are basically variables whose values cannot be changed later. They are created in the same way you create variables but instead of using the var keyword we use the const keyword:

15.scanf

We use another function from the fmt package to read the user input (Scanf). &input will be explained in a later chapter, for now all we need to know is that Scanf fills input with the number we enter.

16.foor_loop

The for statement allows us to repeat a list of statements (a block) multiple times.

17.if-else

If statements also have an optional else part. If the condition evaluates to true then the block after the condition is run, otherwise either the block is skipped or if the else block is present that block is run. If

18.functione1

A function is a group of statements that exist within a program for the purpose of performing a specific task. At a high level, a function takes an input and returns an output.

19.functione2

A function is an independent section of code that maps zero or more input parameters to zero or more output parameters.

2.add

An example program using numbers.

20.functione3

A function is an independent section of code that maps zero or more input parameters to zero or more output parameters.

21.functione4

A function is an independent section of code that maps zero or more input parameters to zero or more output parameters.

22.functione5multiple-variable

Functions in Golang can return multiple values, which is a helpful feature in many practical scenarios. This example declares a function with two return values and calls it from a main function.

23.-anonymousfunctions

An anonymous function is a function that was declared without any named identifier to refer to it. Anonymous functions can accept inputs and return outputs, just as standard functions do.

24.pointer

25.array1

An array is a numbered sequence of elements of a single type with a fixed length.

26.array2

This program computes the average of a series of test scores. If you run it you should see 86.6. Let's walk through the program: • First we create an array of length 5 to hold our test scores, then we fill up each element with a grade • Next we setup a for loop to compute the total score • Finally we divide the total score by the number of elements to find the average

27.array3

28.array4short

Go also provides a shorter syntax for creating arrays:

29.slice1

print slice

29.webside

3.sub-

An example program using two numbers

30slicemakekeyword

If you want to create a slice you should use the built-in make function:

31.slicefunction

Go includes two built-in functions to assist with slices: append and copy. Here is an example of append:

32.slicecopy

After running this program slice1 has [1,2,3] and slice2 has [1,2]. The contents of slice1 are copied into slice2, but since slice2 has room for only two elements only the first two elements of slice1 are copied.

33.scan

34.arithdemo

Go supports the same four basic arithmetic operations such as addition, subtraction, multiplication, and division.

35.increment_decrement

Go has special syntax for increment and decrement. ++ syntax for increment. a++ means a = a + 1 — syntay for decrement. a— means a = a - 1 For

36.importmath

In fmt library, it provides a feature to get input from keyboard. We can use Scanf(). For illustration, we calculate circle area. In this case, we need an input for radius value. Create a folder, called inputdemo.