formatting verbs #

1. %s vs %q?

• Answer:
  • %s prints the string without enclosing it in quotes.
  • %q prints the string enclosed in double quotes, %q can print string, byte slice, runes and int.

2. %v vs %+v vs %#v?

• Answer:
  • %v: Default format, prints the value as is. For structs, it prints only the field values.
  • %+v: Detailed format, includes field names in structs.
  • %#v: Go-syntax representation, includes type information and can be used to recreate the value in Go code.

3. What to use to print slice, maps and structs(composite data types)?

• Answer:
  • %v, %+v, and %#v is mostly used
  • %p prints the pointer of the complex data types

scan function for user input #

• Scan, Scanf and Scanln read from os.Stdin
• Fscan, Fscanf and Fscanln read from a specified io.Reader
• Sscan, Sscanf and Sscanln read from an argument string
• Most importantly, remember to pass pointer instead of the variable as it needs to be written to the same variable space, not the value itself.
• Also, remember to handle errors with fmt.Scan functions
• If we want to do an endless input, we can use the for loop and break the loop if there is any error with the fmt.Scan

1. Difference between fmt.Scan, fmt.Scanf and fmt.Scanln? Answer:
   • fmt.Scan: Reads space-separated values from standard input. Stops reading at the first whitespace.

var a int
var b string
fmt.Scan(&a, &b)
fmt.Printf("a: %d, b: %s\n", a, b)

• fmt.Scanf: Reads input according to a format specifier. Allows more control over the input format.

var a int
var b string
fmt.Scanf("%d %s", &a, &b)
fmt.Printf("a: %d, b: %s\n", a, b)

• fmt.Scanln Reads input until a newline is encountered. Useful for reading a whole line of text or multiple values until the newline.

var b string
fmt.Scanln(&b)