@@ -0,0 +1,223 @@
+package net.zero918nobita.smilepp.frontend;%0A%0Apublic class IntLiteral extends Expression %7B%0A  private int n;%0A%0A  public IntLiteral(int n) %7B%0A    this.n = n;%0A  %7D%0A%0A  public String toString() %7B%0A    return String.valueOf(n);%0A  %7D%0A%7D%0A

Add IntLiteral class