Dapp Development Development Tutorials, Guides & Insights

Replace the contents with the following code to create a counter program:

   use anchor_lang::prelude::*;

   declare_id!("Fg6PaFpoGXkYsidMpWxTWG9AAM9QK2ZrhQWk5raUB7Uq");

   #[program]
   pub mod counter {
       use super::*;
       pub fn initialize(ctx: Context<Initialize>) -> ProgramResult {
           let counter = &mut ctx.accounts.counter;
           counter.count = 0;
           Ok(())
       }

       pub fn increment(ctx: Context<Increment>) -> ProgramResult {
           let counter = &mut ctx.accounts.counter;
           counter.count += 1;
           Ok(())
       }
   }

   #[derive(Accounts)]
   pub struct Initialize<'info> {
       #[account(init, payer = user, space = 8 + 8)]
       pub counter: Account<'info, Counter>,
       #[account(mut)]
       pub user: Signer<'info>,
       pub system_program: Program<'info, System>,
   }

   #[derive(Accounts)]
   pub struct Increment<'info> {
       #[account(mut)]
       pub counter: Account<'info, Counter>,
   }

   #[account]
   pub struct Counter {
       pub count: u64,
   }

Check that the SPL Token CLI is installed correctly:

   spl-token --version

Before starting, ensure you have the following:

• An Ubuntu machine (Ubuntu 20.04 LTS or later is recommended).
• Basic knowledge of using the terminal.
• An internet connection to download necessary packages.