Posts

Showing posts with the label Go lang by example

Looping in go lang

Image
Loop is a structure with the block of statements can be repeated for the finite number of times.  Till Now we have learned the programs that execute sequentially, Now we are going to learn control structures which change the normal flow of the program and helps you to create more meaningful and compact program structure. To understand more, suppose we want to print from 1 to 10 number counting, each number should be printed in the new line. Program to print numbers from 1 to 10 package main import "fmt" func main( ) { fmt.Println(1) fmt.Println(2) fmt.Println(3) fmt.Println(4) fmt.Println(5) fmt.Println(6) fmt.Println(7) fmt.Println(8) fmt.Println(9) fmt.Println(10) } Another compact way to create this program use loop. The following example creates this program using the loop. Program package main import "fmt" func main() { i := 1 //initialization for i ...
Post a Comment
Read more

Convert Temperature from Fahrenheit to centigrade

The formula to convert temperature from Fahrenheit to Centigrade is as below... C = ( F - 32 ) * 5 / 9 where C and F are temperature in Centigrade and Fahrenheit in respectively. package main import "fmt" func main() { var f float32 fmt.Print("Enter the temperature in fahrenheit: ") fmt.Scan(&f) c := ( f - 32 ) * 5 / 9 fmt.Printf("Temprature in centigrade: %.2f",c) }
Post a Comment
Read more

Constant in Go lang

Image
Constant in go lang Constants are basically variable which value can't change once created. Constants are created in the same way as variables, the only difference is that to create a variable use var keyword and to create constant use const keyword. Constant Example-1 package main import "fmt" func main() { const playerName string = "Rahul" fmt.Println(playerName) //playerName = "Micky" //compile time error, cannot assign to playerName. } Constant Example-2 package main import "fmt" func main() { const METER_PER_FEET = 0.3048 var feet,meter float32 fmt.Print("Enter value in feet...") fmt.Scan(&feet) meter = feet * METER_PER_FEET fmt.Printf("Meter %.2f",meter) }  Note: In the above example, METER_PER_FEET is a constant. It is suggested that constant name should be written in uppercase, each word separated by an unders...
Post a Comment
Read more

Simple interest in go lang

package main import "fmt" func main() { var p int var r float32 var t int fmt.Print("Enter principal, rate and time: ") fmt.Scan(&p,&r,&t) si := float32(p) * float32(t) * r / 100 fmt.Printf("Simple interest: %.2f",si) } Explanation  Most of the things of the above program are already discussed. bur some of the important statement is discussed here. si := float32(p) * float32(t) * r / 100 The above program statement performs a simple calculation p * t * r / 100 and stores the result in variable si .  In go lang in a single expression multiple types are not allowed, so we need to convert p and t into float32 type and expression p * t * r becomes a float32 type expression. To typecast a variable we use the following syntax type(var)  In the above program snippet to print the result fmt.Printf("Simple interest : %.2f",si). Printf() is a function used to pri...
Post a Comment
Read more

Identify Variable type and values in go lang

package main import "fmt" func main() { var name string = "Mahesh" age := 25 price := 300.40 fmt.Printf("%T %v\n",name,name) fmt.Printf("%T %v\n",age,age) fmt.Printf("%T %v\n",price,price) } Output string Mahesh int 25 float64 300.4 Explanation In the above program snippet, we use Printf() function   of fmt package to print the formatted output. Withing the Printf( ) %T and %v is called format specifier which represents the output format. %T represents the Type, which prints the variable type %v represents the variable's value. age := 25 , creates a variable age with the short variable declaration and assign the value 25. In this case, the variable automatically receives the type and here age is the type of int. price:=300.40, In this statement price, is created of type float64 because float64 is the default type of floating values in go lang. To create a float32 ty...
Post a Comment
Read more

Sum of two numbers in go lang

package main import "fmt" func main() { var a,b int a = 5 b = 10 sum := a + b fmt.Println("Total = ",sum) } Explanation var a,b int: declare two variable a and b. Learn here  how to create variable a = 5 and b = 10 assign 5,10 to a,b respectively sum:= a + b:   adds a and b and store the result in sum as well as created sum variable with the short variable declaration (:=).  fmt.Println("Total = ",sum):  prints the result as Total = 15 Improvements Above program always returns fixed result Total = 15, because a and b are initialized with fixed value 5, 10 respectively. So this program can be improved by using user input. As well as above program variable declaration and initialization can be done in a single statement as shown here var a,b int = 5 , 10 OR var a,b = 5 , 10 Sum of two numbers with user input package main import "fmt" func main() { var a,b int fmt.Print(...
Post a Comment
Read more

Program to print Hello world in go lang

package main import "fmt" func main() { fmt.Println("Hello Go Lang") } Output  Hello Go lang Explanation If you are a beginner an don't know how to install go lang and run the program, you can learn installation with the installation of go lang . To read the complete explanation of the above program visit, How to print Hello world in go lang .
Post a Comment
Read more

Popular posts from this blog

String in golang

Image
Strings are sequence of characters with definite length and can be created by enclosing in double quotes "Hello Go" and back ticks `Hello Go`.  A string is a sequence of characters. Strings are the collection of individual bytes, where each character occupy single byte. Characters out of the ASCII characters (can say characters from other languages) occupy more than one byte. A string can be created by enclosing in double quotes "Hello Go" or backticks `Hello Go`. The difference between double quotes and backticks is that double quotes allow escape sequences like \n (newline) and \t (tab) and parses them but backticks don't. Example-1: package main import "fmt" func main( ) {         fmt.Println(len("Hello Go"))         fmt.Println("Hello Go"[1])         fmt.Println("Hello"+" "+"Go") } Output:  8 101 Hello Go   Output Explained: fmt.Println(len("Hello Go")) ...
Read more

Arrays in C Language

Image
Suppose you want to store the 10 numbers. The one choice is to create a 10 different variable but it is difficult when number of variable are increases. So the next solution that is more feasible is array. An array is the collection of various similar type elements stored in contiguous memory locations. All the array elements share the common name. To uniquely identify each element an index or subscript is associated with the element. so the array is also known as subscript variable . In the given figure arrangement of array elements are shown. The address of the first element is 100. If the given array is of type integer and integer occupies 2 bytes then the next element in the array has address 102,104 etc as given in the figure. How to access array elements using subscript operator it is also shown in the given figure. Array index always start with 0. To access array element subscript operator is used.[] is called subscript operator.a[0] read a of 0 or 0th element of a C...
Read more

Literals in Java

Image
Literals in Java int a = 5; In the above expression, a is a variable but 5 is literal. Literal can be of many types, we will discuss all types of literal one by one. Integral Literal Any integer constant is treated as integral literal. it can be written in 3 formats. int a = 10; (decimal format) int a = 010; (octal format, equivalent to 8) int a = 0x10; (hexadecimal format, equivalent to 16) Note: Octal constants can contain digits from 0 to 9. Hexadecimal constants can contains digits from 0 to 9 and a to f, where a to f can be uppercase or lowercase. Example - 1: int a = 10;    ( ✓ ) int a = 0678;    (✕) // Compile time error, number too large int a = 0777;   ( ✓ ) int a = 0xace;   ( ✓ ) int a = 0xBeer;    (✕) // Compile time error, number too large Example - 2: int a; a = 10 + 010 + 0x10; System.out.println(a); // 34, because 010 = 8 and 0x10 = 16 so 10 + 8 + 16 Important Notes We(pr...
Read more

Pointers in C Language

Image
Pointer is called the soul of c. The importance of pointer can be understood by the fact that most of the device driver or embedded system program are created in c. Pointer makes the c most usable and flexible programming. Due to the availability of the pointer, it is possible to write a program such as a device driver. These programs are also known as the device driver. To understand the pointer we have to first understand the memory organization of any variable. The following figure shows the fact. Whenever a variable stored in memory it occupies some memory space and every memory space has a unique number associated with it known as an address. Every byte in member has a different address. If we create an integer variable and suppose it occupy 2 bytes in memory, then two addresses are associated with it but its first address is enough to access it. so the address of next bytes is less useful. To access the address of a variable & (Address of) operator is used. To understa...
Read more

Inline V/S Block Level Element

Image
What is Element? An element is the combination of opening tag, closing tag and text between the opening and closing tag. The following figure helps you to understand, what is an element? Element in Html Types of Element in HTML Block level elements Inline elements Block level Element Block Level elements are those which always starts from a new line. Examples of block level elements All Headings (h1,  h2,  h3,  h4, h5, h6) Paragraphs Lists Inline Element Inline elements are those, which don’t change the line automatically. Examples of inline element Bold (<b>Bold</b>) Italic (<i>Italic</i>)  Underline (<i>Underline</i>) Links (<a>Links</a>) Watch the video
Read more

Reserved Words in Java

Image
What is Reserved Words. In every language some words are already reserved to represent some action or meaning. For example in English some reserve words are listed below. Apple Run Cat Dog Eat Similarly in Java there are some words which meaning is already reserved, such words are called reserved words / keywords. In Java, Only 53 words are reserved words. Difference between Keywords and Reserved Literals If reserve words represents some functionality, then called Keywords . If reserve words represents some value, the called Reserve Literals . Reserve Literals (3) true (boolean value) false (boolean value) null (Object reference value) Keywords (50) Used Keywords (48) Unused Keyword (2) Goto Const All 53 Reserved Words List Data types (8) byte short int long float double boolean char Flow Control (11) if else switch case default while for do break continue return Modifiers (11) public private pr...
Read more

Identifiers

Image
What is identifier. A Name in Java program is called identifier, which can be used for identification purpose. It can be a class name, interface name, method name, label name, variable name etc. Example In the above example words marked with red underline are identifiers. As you can see there are 5 identifiers Test (Class Name) main (Method Name) String (Pre-defined Class Name) args (Variable Name) println(Method Name) Rules / Convention for Identifier Naming While defining Java identifier name, we have to follow some rules as listed below. Allowed characters in Java identifier are listed below.  A to Z (Uppercase letters) a to z (Lowercase letters) 0 to 9 (Digits) _ (Underscore) $ (Dollar sign) Example:  contact_number ( ✓ ) contact#   (✕) Identifier can't starts with digit. Example abc123 ( ✓ ) 123abc (✕) Java is a case sensitive language all variable listed below are different, but it is not a good pr...
Read more

Data Types in Go language

Image
Data type defines a set of related values, describe the operations that can be done on them and define the way the stored in memory.  For example: Suppose you have a Car of VW Polo, but a car can be of any other company with some other basic and some advanced features. But if we called a name Car, then in your mind a picture is created that there is a vehicle with 4-wheels and steering. Each car has some features like the color, company, make, model etc. Types in programming work in a similar way, For example, "Hello World" is a string and every string have some length. Numbers Go Comes with different types to represent numbers, Numbers can be categorized into two broad categories... Integer The integer represents only those numbers which don't include any decimal places and can be of any positive and negative numbers. Example : {1, 3, -4, 11, 123, 534} all are integer numbers Go's integer type can be uint8, uint16, uint32, uint64, int8, int16, in...
Read more

Printing in C programming

Image
Printing in C In C for printing purpose, We Use A Function Called printf( ) . A function is a small program used to perform a specific task. The function receives some input known as an argument and produces some output called return value. Functions are always suffixed with parenthesis ( ). Syntax of printf( ) printf("Control String",[List or Variable]); Note: Control string is a sequence of characters which you want to print. ([ ]) square brackets around the list or variable represent that it is optimal. Example Of printf( ) printf("hello"); //Print hello int a=5,b=6; printf("a=%d b=%d",a,b); //print the value of a and b. int a=5,b=6; //Varialbe Declaration printf("%d",a+b); //Print 11. Note: In printf( ) expression can be written .The example is given above. The first program, Say Hello World in C programming /*program to print the "Hello world"*/ #include<stdio.h> int main() { printf(...
Read more

Variable Naming & Scope of Variable

Image
Rules for Creating the variable name Variable name can contain Alphabets (A-Z/a-z), Digits (0-9) and Underscore( _ ). A variable name must start with alphabet or underscore. Spaces and special systems are not allowed. Reserved words are not allowed as a variable name. A variable name should be meaningful. Go is case sensitive language so age, Age, AGE all are treated as a different variable. Some correct variable names name father_name fatherName __AGE number1 car_modal_name is_verified intnum Some incorrect variable names father's_name father#name 2persons 0007 000Name int a#b Note There are two popular ways to create multi-word variables. player_name: Each word is separated by an underscore playerName: camel case, the first word is in small and from second word first letter of each word is capitalized. Variable Scope Scope is the range of places where a variable is allowed to be used is called variable scope.Variable Scope can ...
Read more