Answer / somnath

=> Symget is used to resolve macro variables in data step
and & is used to resolve macro variable in macro processing.
For example, if you have 10 macro variables name1-name10
which contains 10 names and you want to get a particular
name in a data step then you can use symget, not &.
data rank;
i=4;
run;

data name;
set rank;
name=symget('name' || left(put(i, 8.)));
run;

=> The same concept applies for call symput.

The main idea is that the routines symget and symput are
executed at sas run-time where & and %let executes at macro
run time, much before that sas executes it.

What is abstract Method i want the exact definition and is there any possibility to declare class as abstract without any abstract methods in that class?If it is possible then tell me why and how?

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7.x=10; y=20; x<<2=? x<<1=? y>>2=?

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Create a class TicTacToe that will enable you to write a complete program to play the game of Tic-Tac-Toe. The class contains as private data a 3- by-3 double array of integers. The constructor should initialize the empty board to all zeros. Allow two human players. Wherever the first player moves, place a 1 in the specified square; place a 2 wherever the second player moves. Each move must be to an empty square. After each move determine whether the game has been won and whether the game is a draw. If you feel ambitious, modify your program so that the computer makes the moves for one of the players automatically. Also, allow the player to specify whether he or she wants to go first or second. If you feel exceptionally ambitious, develop a program that will play three-dimensional Tic-Tac-Toe on a 4-by-4-by-4

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I'm trying to solve this. But I'm not figuring the right solution. Can some one help what the answer is for the question below? You can use as many variables as you need, there are no negative numbers, all numbers are integers. You do not know the size of the integers, they could be infinitely large, so you can't count on truncating at any point. There are NO comparisons allowed, no if statements or anything like that. There are only four operations you can do on a variable. 1) You can set a variable to 0. 2) You can set a variable = another variable. 3) You can increment a variable (only by 1), and it's a post increment. 4) You can loop. So, if you were to say loop(v1) and v1 = 10, your loop would execute 10 times, but the value in v1 wouldn't change so the first line in the loop can change value of v1 without changing the number of times you loop. You need to do 3 things. 1) Write a function that decrements by 1. 2) Write a function that subtracts one variable from another. 3) Write a function that divides one variable by another. 4) See if you can implement all 3 using at most 4 variables. Meaning, you're not making function calls now, you're making macros. And at most you can have 4 variables. The restriction really only applies to divide, the other 2 are easy to do with 4 vars or less. Division on the other hand is dependent on the other 2 functions, so, if subtract requires 3 variables, then divide only has 1 variable left unchanged after a call to subtract. Basically, just make your function calls to decrement and subtract so you pass your vars in by reference, and you can't declare any new variables in a function, what you pass in is all it gets.

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