golang printf and println

Printf and Println are two functions provided by the fmt package in GoLang for printing formatted output and writing to standard output respectively.

1. Printf:

The fmt.Printf function in GoLang allows you to format and print data to the standard output (which is usually your terminal). It's similar to printf in other languages like C or PHP. You can use format specifiers such as %s for strings, %d for integers, %f for floating point numbers, etc.

Here's an example:

package main

import "fmt"

func main() {
    name := "John"
    age := 30
    fmt.Printf("My name is %s and I am %d years old.", name, age)
}

In this example, %s will be replaced by the string variable name and %d will be replaced by the integer variable age.

2. Println:

The fmt.Println function in GoLang prints its arguments followed by a newline. It converts the variables into strings (if they aren't already) and adds a space between each argument.

Here's an example:

package main

import "fmt"

func main() {
    name := "John"
    age := 30
    fmt.Println("My name is", name, "and I am", age, "years old.")
}

In this example, Println will add a space between each argument and a newline at the end.

Printf is more flexible as it allows for string formatting, however, Println is more straightforward and easier to use when formatting isn't required.

The ln in Println stands for line. This means that Println will add a newline character ('\n') at the end of whatever is being printed. This will cause anything printed after a Println statement to appear on a new line.

The f in Printf stands for format. This means the function will interpret the string as a format string that specifies how subsequent arguments are formatted. For example, %s for strings, %d for integers, and %f for floating-point numbers.

Here's an example:

package main

import "fmt"

func main() {
    name := "John"
    age := 30
    fmt.Printf("My name is %s and I am %d years old.", name, age)
}

In this example, %s will be replaced by the string variable name and %d will be replaced by the integer variable age.