65 lines
1.7 KiB
Rust
65 lines
1.7 KiB
Rust
use std::io;
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fn get_input()->u32
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{
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loop
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{
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let mut input = String::new();
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io::stdin()
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.read_line(&mut input)
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.expect("Failed to read line");
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match input.trim().parse()
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{
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Ok(num) => return num,
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Err(_) =>
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{
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println!("Expected Valid Number");
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}
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};
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}
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}
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fn prime(limit:u32)->i8
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{
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if limit < 2
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{
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println!("None");
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return -1;
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}
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println!("\t2");
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if limit == 2
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{
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return 0;
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}
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let mut b;
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for i in (3..=limit).step_by(2)
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{
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b = true;
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if i%2 != 0
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{
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for j in (3..=(i as f64).sqrt()as u32).step_by(2)
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{
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if i%j == 0
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{
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//println!("{} is even", i);
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b = false;
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break;
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}
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}
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if b == true
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{
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println!("\t{}", i);
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}
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}
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}
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return 0;
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}
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fn main()
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{
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println!("Hello, world!");
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println!("Limit for Prime = ↓");
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prime(get_input());
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}
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