add functions

control_flow/src/main.rs

@@ -86,4 +86,24 @@ fn main() {
     {
         println!("for loop including: {}",x);
     }
+
+    //functions
+    custom_func();
+    say_name("John Cena");
+    println!("{}", sum(1,5));
+}
+
+fn custom_func()
+{
+    println!("custom func");
+}
+
+fn say_name(name: &str)
+{
+    println!("my name is: {}",name);
+}
+
+fn sum(number1 : i32, number2 : i32) -> i32
+{
+    return number1 + number2;a
 }