Seems OK to me.
$ g++ foo.cpp
$ ./a.out
welcome to My First Calc!Enter The ID Of the Task.
1.Add
2.Subtract
3.Multiply
4 Divide
Type: Posts; User: Salem
Seems OK to me.
$ g++ foo.cpp
$ ./a.out
welcome to My First Calc!Enter The ID Of the Task.
1.Add
2.Subtract
3.Multiply
4 Divide