C Prog

PreeMaria · 11-07-2009, 09:45 AM

Pz help..!

How can we get a result such 2 if the user enters 1 , 4 if 2, 6 if 3......
without using +,-,/,%,*,pow(),sqrt(),^ these operators..?

Wat is the logic?

Plz help me with this.

Subsonics · 11-07-2009, 09:53 AM

Bitwise?

Memloop · 11-07-2009, 01:54 PM

C - Bitwise Shift Operators - Left Shift, Right Shift

rpbear · 11-08-2009, 12:24 AM

Code:

#include<stdio.h>
#include<stdlib.h>

int
main(){
	
	int i = 0x1;
	int n = 0,input = 0,output = 0;
	scanf("%d",&n);
	input = n;
	while(n--)
		output = input<<1;
	
	printf("%d\n",output);
	return EXIT_SUCCESS;
}

Subsonics · 11-08-2009, 10:01 AM

Fair enough, I though this was most certainly homework, and if you get a question like this you must have at some point gone over bitwise operators and bitshifts. I don't see how you can give anything else than hint without giving the whole answer away. It's no special logic involved.

You can do this without the while loop and only one variable btw,

Code:

scanf("%d", &n);
printf("%d\n", n<<1);

11-07-2009, 09:45 AM	#1
PreeMaria Registered User Join Date: Nov 2009 Posts: 1	C Prog Pz help..! How can we get a result such 2 if the user enters 1 , 4 if 2, 6 if 3...... without using +,-,/,%,*,pow(),sqrt(),^ these operators..? Wat is the logic? Plz help me with this.
PreeMaria is offline

11-07-2009, 09:53 AM	#2
Subsonics Registered User Join Date: Jan 2009 Posts: 154	Bitwise?
Subsonics is offline

11-07-2009, 01:54 PM	#3
Memloop Robot Join Date: Mar 2009 Posts: 100	C - Bitwise Shift Operators - Left Shift, Right Shift
Memloop is offline

11-08-2009, 12:24 AM	#4
rpbear Registered User Join Date: Nov 2009 Posts: 8	show a example Code: #include<stdio.h> #include<stdlib.h> int main(){ int i = 0x1; int n = 0,input = 0,output = 0; scanf("%d",&n); input = n; while(n--) output = input<<1; printf("%d\n",output); return EXIT_SUCCESS; }
rpbear is offline

11-08-2009, 10:01 AM	#5
Subsonics Registered User Join Date: Jan 2009 Posts: 154	Fair enough, I though this was most certainly homework, and if you get a question like this you must have at some point gone over bitwise operators and bitshifts. I don't see how you can give anything else than hint without giving the whole answer away. It's no special logic involved. You can do this without the while loop and only one variable btw, Code: scanf("%d", &n); printf("%d\n", n<<1);
Subsonics is offline

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