prime

9-prime_numbers/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "prime_numbers"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

9-prime_numbers/src/main.rs

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