How to Read a Set of Integers in Golang Without Using For Loops?

Reading a Set of Integers from Standard Input in Golang Without Using For Loops

In Golang, reading a list of integers from standard input and storing them in an integer slice can be achieved efficiently without the need for explicit for loops.

To accomplish this, you can leverage the fmt.Scan function along with recursive helper functions to simplify the input reading process. Here's a breakdown of the approach:

1. Read the number of integers:

   • Prompt the user to enter the number of integers they want to input.
   • Use fmt.Scan to read the input into a variable n, representing the total number of integers.

2. Initialize the slice:

   • Create an integer slice all with a capacity equal to n, representing the collection of integers to be read.

3. Define a recursive helper function ReadN:

   • This function takes the following arguments:

     • all: The integer slice to which the integers will be added.
     • i: The current index in the slice.
     • n: The remaining number of integers to read.

   • In the function:

     • If n is 0, there are no more integers to read.
     • Read an integer into all[i] using fmt.Scan.
     • Recursively call ReadN with updated values for i and n.

4. Call ReadN:

   • Once the slice is initialized, call ReadN with the all slice, 0 as the initial index, and n as the remaining count.

By utilizing recursion and eliminating the need for explicit for loops, this method streamlines the process of reading and storing integers in an integer slice. For even faster input scanning, you can consider customizing the Scan function to optimize input reading performance.

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