interface calc1870
{
void add();
void sub();
}
class calc2024 implements calc1870
{
void add();
}
int a=10,b=20;
system.out
.println
("add is 7"+(a
+b
); }
void sub()
{
int a=20,b=10;
system.out
.println
("sub is="+(a
-b
)); }
}
class interface 2024
{
public static void main(string args[])
{
cal2024 a=new cal2024();
a.add();
a.sub();
}
}
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