ejemplo0224Ene2024.rs

use std::collections::HashMap;

fn f1(x:i32) -> Option<bool>
{
   
    if  x>=0 && x<=100
    {
        Some(true)
    } 
    else if x>=101 && x<=200
    {
        Some(false)
    }
    else
    {
        None
    }
}

fn f2(x:f32) -> Result<f32,u32>
{
   if x!=0.0 && x>0.0
   {
      Ok( 1.0/x)
   } 
   else if x<0.0
   {
    Err(404)
   }
   else
   {
     Err(500)
   }
}

fn main()
{
    let mut vec01: Vec<i32> = Vec::new();
    vec01.push(5);
    for i in  101..110
    {
       vec01.push(i);
    }
    println!("{:?}",vec01);
    println!("{}",vec01[3]);
    println!("{}",vec01.len());
    let  top = &vec01[0];
    println!("{:?}",top);
    let mut bottom = &vec01[vec01.len()-1];
    println!("{:?}",bottom);
    vec01.push(130);
    println!("{:?}",vec01);  
    bottom = &vec01[vec01.len()-1];
    println!("{:?}",bottom);
    vec01.remove(vec01.len()-1);
    bottom = &vec01[vec01.len()-1];
    println!("{:?}",bottom);
    
    println!("{:?}",f1(1).unwrap());
    println!("{:?}",f1(150).unwrap());
    println!("{:?}",f1(1500));
    
    println!("{:?}",f2(0.5));
    println!("{:?}",f2(0.333).unwrap());
    println!("{:?}",f2(0.0));
    match f2(-1.0)
    {
        Ok(x) => println!("Resultado {}",x),
        Err(404) => println!("no dar valor 0"),
        Err(500) => println!("no dar valor negativo"),
        Err(0_u32..=403_u32) | Err(405_u32..=499_u32) | Err(501_u32..=u32::MAX) => panic!("Codigo no conocido")
    }
    
    let mut hsh1: HashMap<String,i32>= HashMap::new();
    hsh1.insert(String::from("CUTG"),1);
    hsh1.insert(String::from("TOMD"),2);
    let v0=hsh1.get("CUTG");
    match v0 
    {
      Some(v) => println!("{}",v),
      None => println!("No existe")
    };
    let v1=hsh1.get("AAA");
    match v1 
    {
      Some(v) => println!("{}",v),
      None => println!("No existe")
    };
  
}