Tutorials Programming Tutorials, Guides & Best Practices

   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,
   }

• This code defines a Solana program with two functions: initialize and increment.
• The initialize function sets up the counter with an initial value of zero.
• The increment function increases the counter's value by one.