changes

src/main.rs

@@ -18,6 +18,15 @@ impl Trader {
 	    balances: HashMap::new()
 	    }
         }
+    fn add_balance(&mut self, cur:i32, delta:u64) {
+	self.balances.entry(cur).and_modify(|ent| *ent+=delta ).or_insert_with(|| delta);
+	}
+    fn sub_balance(&mut self, cur:i32, delta:u64) {
+	self.balances.entry(cur).and_modify(|ent| *ent-=delta );
+	}
+    fn get_balance(&self, cur:i32) -> u64 {
+        *self.balances.get(&cur).map(|bal| bal).unwrap_or(&0u64)
+	}
     }
 
 #[derive(Debug, Clone)]
@@ -232,6 +241,11 @@ fn fxp_mult(a: u64, b: u64) -> u64 {
 }
 
 fn main() {
+  let mut t1=Trader::new("Teppy",1);
+  t1.add_balance(1,100);
+  t1.add_balance(2,150);
+  t1.sub_balance(1, 25);
+  println!("Balances are {} and {}",t1.get_balance(1),t1.get_balance(2));
   let mut m=Market::new(); // USD type is 1, EUR type is 2, BTC type is 10, ETH type is 11, SOL type is 12
   let usd=m.register_asset("USD");
   let btc=m.register_asset("BTC");