pow 제곱 연산

	void pow2(){
		int i=0;;
		int num = 1;
		string a;
		for(num=1;num<2048;num = num * 2,i = i +1){
			a ="Pow (2."+ i + ")=  " +num;
			print (a);
		}
	}
	void pow(){
		int i = 0;
		int num = 1;
		string a;
		while(true) {
			a = "Pow (2, " + i + " ) = "+num;
			print (a);
			i = i+1;// = i++;
			num = num * 2;
			if(num> 2048) break;
		}
	}