how to set Nth bit of variable by using MACRO
- 3 Answers
- 25582 Views
- HCL, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / kirankumaryakkala
#define set(val,n) val|=1<<n //do left-shift then bitwise OR
logic is val|=1<<n
means,
first shift the value 1 to ntimes and do the bitwise or with
value.
u will get the answer
| Is This Answer Correct ? | 30 Yes | 6 No |
Answer / vikram
The above code is wrong it should be n-1 instead of n.
#include<stdio.h>
#define SET(val,n) (val|=1<<(n-1))
main()
{
int n = 256;
printf("%d",SET(n,1));
}
| Is This Answer Correct ? | 13 Yes | 8 No |
Answer / sunitha
/* macro to set Nth bit */
#define SET_N_BIT(x,n) x|((~(unsigned)0)>>(8-(n-n-1))<<n);
Try out this . this is optimised version for setting a bit
work for any bit upto 8 bits if u want for 32 bits than
replace 8 with 32.
| Is This Answer Correct ? | 3 Yes | 0 No |
How to declare a variable?
input any 4 digit number and find the difference of all the digits?
What are c header files?
character array A[12] can hold
Why ordinary variable store only one value
What is a far pointer in c?
typedef struct { int i:8; char c:9; float f:20; }st_temp; int getdata(st_temp *stptr) { stptr->i = 99; return stptr->i; } main() { st_temp local; int i; local.c = 'v'; local.i = 9; local.f = 23.65; printf(" %d %c %f",local.i,local.c,local.f); i = getdata(&local); printf("\n %d",i); getch(); } why there there is an error during compiling the above program?
x=2,y=6,z=6 x=y==z; printf(%d",x)
13 Answers Bharat, Cisco, HCL, TCS,
how to use enum datatype?Please explain me?
Explain what happens if you free a pointer twice?
in linking some of os executables are linking name some of them
What is a void pointer in c?
C 
